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Chemistry, as a field, often weaves its history through innovations both simple and significant, looping from one puzzle to the next. Tracing the emergence of 1-Naphthyl Phosphate takes us back through the growth of organic chemistry in the 20th century, when researchers probed the substrate specificity of enzymes like alkaline phosphatases. Back then, natural biochemistry materials such as naphthol derivatives stood out for their use in staining and detection methods. Their utility as chromogenic substrates came under the spotlight during the expansion of the fields of pathology and enzymology. There’s an inherent charm in how bench chemists discovered that phosphate monoesters, once considered chemical curiosities, provided essential tests and opened new views on both biological and chemical pathways. Over time, the chemical was refined, and laboratories started using it both for practical and research-focused enzyme assays, as well as in histochemical slides throughout diagnostic medicine.
1-Naphthyl Phosphate sits as an organic phosphate ester, mostly encountered as its disodium or disodium salt for practical solubility. Often odorless and light-colored, it’s primarily deployed as a substrate in biological staining protocols. What gives it attraction among researchers is the clean, visible reaction it offers with phosphatase enzymes, making it easier to track enzyme activity even with basic laboratory equipment. Rather than stay locked down in niche biochemical processes, it shows up in enzyme-linked immunosorbent assays – the ELISA plates many scientists and diagnosticians routinely use. As someone who has sat through more than their share of long titration and microplate wash steps, the reliability and color contrast 1-Naphthyl Phosphate delivers can’t be overstated. In real-world practice, anything that shaves uncertainty out of a routine diagnostic matters for patient care, efficient workflow, and reproducibility.
Looking at its makeup, 1-Naphthyl Phosphate comes across as a fine, typically crystalline powder that dissolves in water. The molecule fuses naphthalene’s aromatic backbone with a phosphate ester group – a bridge that makes it both hydrophilic enough for biological work and stable for storage. Chemically, the phosphate group gets cleaved in the presence of phosphatase enzymes, releasing naphthol, which then reacts with coupling agents to produce a distinct color. That color jump makes it perfect for visual detection. This balance of stability on the shelf but ready reactivity in testing is a practical triumph. There’s no fuss or need for special atmospheric conditions; standard lab storage away from direct light and moisture keeps the chemical robust for months, even years.
Bottle labels and datasheets for 1-Naphthyl Phosphate capsules or powders generally specify its purity – often upwards of 98% for research grade – along with molecular weight, solubility in water, and pH range for optimal use. Concentration standards run around 10-50 mM for most detection protocols. For those handling the compound, direct information on detection wavelength, usually in the visible range, helps standardize assays. As someone who’s prepared hundreds of assay buffers, clarity on these numbers can spare headaches from batch-to-batch variability. A clear line of data between supplier documents and action in the lab allows for fast troubleshooting and much more meaningful reproducibility across experiments, something research integrity hinges on.
Synthesizing 1-Naphthyl Phosphate involves phosphorylating 1-naphthol, typically using phosphoryl chloride or similar reagents under well-controlled pH and temperature conditions. The process demands careful handling, as phosphorylation reactions are sensitive to atmosphere and moisture. Since the late 20th century, improvements in synthetic routes have trimmed down waste and tightened purity. In academic settings, a skilled bench chemist, given the right fume hood and reagents, can generate reasonably pure 1-Naphthyl Phosphate without much specialized equipment. Yet modern production, especially for high-purity needs, leans on automated purification and strict in-process controls. Reliable supply of this substrate underpins many medical and biological assays, which makes the security and transparency of the preparation process more than a technicality.
In practical use, 1-Naphthyl Phosphate reacts readily with enzymes such as alkaline phosphatase. This reaction splits off the phosphate group, releasing free naphthol. The freed naphthol often finds itself reacting further after combining with diazonium salts like Fast Red or Fast Blue, which produces a colored azo dye right within the test medium. Simple, visual, and trustworthy results. Researchers sometimes tweak the phosphate group, using substituted derivatives to push selectivity or signal intensity. This tuning process gets at the essence of method development in research labs: taking a perfectly serviceable molecular scaffold, then searching for sharper response or better background control.
Across suppliers and publications, the compound goes by names such as α-Naphthyl phosphate, 1-Naphthyl acid phosphate, or simply NPP. A handful of trade names, often tied to diagnostic kit makers, sometimes brand the substrate according to the preferred buffer type or salt. Scientists and technicians alike know to double-check the fine print, as nomenclature swaps between alpha and numeric notation can tangle results in literature reviews or cross-lab communication. Sticking to established IUPAC and CAS registry numbers typically keeps confusion to a minimum, so long as people avoid company jargon and go for the raw chemical identifier.
Handling 1-Naphthyl Phosphate doesn’t call for space-age protocols, but discipline matters. Prolonged skin or airway exposure may cause irritation, especially in powder form. Gloves, lab coats, and eye protection offer the easiest safety net. Workspaces benefit from good ventilation – not just for this compound, but because the enzyme reactions often involve volatile coupling agents. I’ve watched careless handling lead to minor rashes for lab newcomers, especially those skipping basic personal protective equipment, underestimating the potential sensitivities of aromatic amines and their phosphates. Environmental regulations push for careful cleanup to prevent contamination in the water supply. Waste solutions should pass through approved chemical disposal, rather than slipping down the drain, as breakdown products present low-level environmental risks if handled carelessly.
1-Naphthyl Phosphate draws its value from versatility. Diagnostic medicine leans on its colorimetric detection of phosphatase activity in blood and tissues, guiding everything from liver function panels to cancer staging. Environmental health labs detect runoff contamination using similar enzyme-linked approaches. Plant physiologists test phosphatase action in roots, revealing nitrogen and phosphorus cycling as crops respond to soil changes. Academic researchers overlap these avenues, probing everything from cell signaling to membrane transport proteins. In each field, fast, reproducible color generation forms the backbone of complex analytical workflows. Years spent troubleshooting colorimetric assays showed me how robust substrates like 1-Naphthyl Phosphate can mean the difference between experimental dead ends and breakthrough data. Having a readily available tool that works in 96-well, 384-well, or even high-throughput formats enables both clinical and academic users to chase new biomarkers, get reliable patient results, and track large biological datasets.
The push for higher sensitivity and lower signal noise moves the research world forward. Developers look at 1-Naphthyl Phosphate’s chemistry, then try pairing it with alternate coupling agents, or tweaking buffer systems, to drive clearer signal and sharper endpoints. Other groups chase multiplexing, turning the colorimetric response into readouts for quantitative imaging or lateral flow strips. As automation seeps into more clinical labs, robotics and machine learning now analyze color gradients generated by 1-Naphthyl Phosphate in thousands of wells per day. That kind of throughput drives down testing costs and lets researchers jump between batches and platforms without rewriting protocols. From my experience, researchers celebrate any substrate able to juggle these transitions without constant recalibration, which underlines why development money keeps flowing into small but vital improvements.
Toxicology pushes deeper than just human safety in the lab. While accidental exposure rarely causes major harm under normal conditions, the degradation products of 1-Naphthyl Phosphate, especially naphthols, can show mild to moderate toxicity in aquatic life and test animals. Studies on chronic exposure have flagged low-level cytotoxic effects, mainly after high-concentration, repeated dosing not typical for human work. Workers who regularly handle kilogram-scale batches stand at greater risk than routine bench users. Ongoing monitoring, personal protective equipment, and robust waste management continue to shrink exposure risk. New research into enzyme inhibitors and selectivity promises even safer derivatives, with less off-target reactivity. Drawing an example from green chemistry initiatives, attempts to tune the degradation profile for less persistent byproducts push the field toward safer workplace and environmental standards.
What’s next for 1-Naphthyl Phosphate comes down to both science and society. As reporting rules on diagnostic reproducibility clamp down, well-characterized and reliable substrates enjoy a long runway in clinical and laboratory testing. The rise of point-of-care diagnostics in developing regions, combined with shrinking costs for high-throughput screening, only widens demand. Integrating digital color recognition and mobile health tools may soon mean field tests using 1-Naphthyl Phosphate reactions produce not just pass/fail answers, but full digital records, even in remote clinics. On the environmental side, designers increasingly look for greener synthesis and breakdown, pushing green chemistry into what was once considered settled science. As someone who’s tracked both the frustrations and small victories in assay chemistry, I see the ongoing development of 1-Naphthyl Phosphate as a reflection of chemistry’s best traditions: constant revision, practical solutions, and a sharp-eyed focus on supporting human health and basic research alike.
1-Naphthyl phosphate does a lot in biomedical research. I have seen scientists reach for this chemical during enzyme assays because it acts as a substrate for many enzymes, including acid and alkaline phosphatases. When my team wanted to figure out enzyme activity, we needed a good substrate that doesn’t interfere with the results. 1-Naphthyl phosphate came up often, since it releases a naphthol molecule when cleaved by the enzyme. That naphthol reacts fast with a color-developing agent, making it easy to spot using a colorimeter or even by eye if the concentration is high enough.
This clear response lets researchers measure how much enzyme is present or how active it is, without a complicated setup. I found this useful in university during those late-night projects where accuracy and speed matter. No one wants to wait hours for a result in a teaching or medical lab. With 1-naphthyl phosphate, results often come within minutes, which helps labs move faster, especially in clinical diagnostics where time can mean everything.
In hospitals, enzyme assays using this compound have helped biochemistry teams check for problems with the liver, bones, or even cancers. Enzyme levels in the blood often relate to health issues, and 1-naphthyl phosphate provides a reliable way to measure them. Widespread adoption of this test means doctors can compare results across patients and hospitals, giving it an important spot in routine diagnostics.
The history of this compound goes back decades. It’s still commonly chosen over newer substrates for some tests because it works, it’s affordable, and it gives consistent, reliable outcomes. My own experiences in clinical settings showed me that professionals rely on it precisely for those reasons. Some enzyme-linked immunoassay kits use this substrate in their protocols. If a hospital needs to track an infection or cancer marker, there's a good chance the lab technician poured 1-naphthyl phosphate into a tray that day.
Researchers look for ways to make assays even faster and more sensitive. That includes tweaking conditions with 1-naphthyl phosphate—adjusting pH or combining it with different detection agents. The goal is to spot disease earlier or track subtle changes in enzyme activity. I’ve seen some innovation in coupling this chemical with fluorescence or electrochemical sensors, which could offer even more precise information in the future.
Not everything works out of the box, though. Occasionally, the substrate can react with other components in the mixture, so staff must follow strict protocols and use controls. I remember misreading an assay once because I didn’t add the right buffer. Experience taught me to check every reagent and stick to validated methods, since patient health depends on correct data.
Safety counts in any lab. 1-Naphthyl phosphate is less hazardous compared to some alternatives, though everyone still handles it with gloves and goggles. Waste containing the by-products goes through chemical treatment before disposal, which I’ve learned keeps the environment safer. A push for more sustainable lab practices means researchers hunt for substrates that break down easily and don’t pollute water systems. Finding a greener alternative with the strengths of 1-naphthyl phosphate would help science and the planet both.
Reliable, simple, and effective, 1-naphthyl phosphate holds its own in labs and hospitals around the world. It keeps letting scientists ask – and answer – tough questions about health and disease, while also pushing us all to do the work with more care for people and the environment.
1-Naphthyl phosphate catches the eye in chemistry labs thanks to its distinctive build. As someone who’s mixed test tubes and scribbled reaction schemes till late, I see chemicals not just as formulas, but as characters in the ongoing story of science. This molecule carries the naphthalene ring—a flat, double-ring structure packed with carbon atoms and hydrogen atoms, arranged in two fused benzene rings. Chemists know this shape: it's sturdy, aromatic, and pops up in many dye molecules, drugs, and biochemical tests.
Attached to the naphthalene backbone at the “1” position, there’s a phosphate group. Phosphate isn’t just any decoration; it comes with one phosphorus atom double-bonded to an oxygen, single-bonded to three more oxygens. One of those oxygens glues itself directly to the naphthalene ring, forging a bond that brings water solubility and reactive power, which you see play out in countless biology experiments.
In academic science and medical diagnostics, 1-naphthyl phosphate acts as more than a chemical curiosity. Its real job often comes as a substrate for enzymes like alkaline phosphatase. In textbooks and glowing bottles in biochemistry fridges, students use it to watch enzymes at work. The basic structure—with the phosphate on one end and the solid naphthalene core on the other—lets it slip into enzyme sites. Alkaline phosphatase cleaves off the phosphate group, releasing 1-naphthol, which then manages to produce a vivid color change with a quick chemical tweak. Every time a test turns color, the chemical’s shape is making all the difference.
Color-changing reactions using 1-naphthyl phosphate help labs quickly spot enzyme activity, even in tiny samples. In hospital settings, this turns into early detection tests for diseases. As a student watching hundreds of lab strips shift shades, I’ve seen the link between molecular structure and practical impact—a clear, visual answer at the bottom of a test tube.
Pure, well-characterized 1-naphthyl phosphate is essential if labs want trustworthy test results. Any stray impurity risks tripping up enzyme reactions, so the shape and composition must always match the expected standard. Check a reputable chemistry supply catalog, and you'll see lengthy certifications on molecular structure, purity percentage, and batch traceability. This vigilance protects patients, research results, and careers.
Safety adds another dimension. Like many aromatic compounds, 1-naphthyl phosphate demands respect. Spills call for gloves and proper waste handling because aromatic rings and phosphate groups both introduce potential toxicity. Experience in the lab teaches this lesson early: structure isn’t just about how atoms connect, but also about how chemicals behave in the hands of real people.
Chemists continue to tweak the 1-naphthyl phosphate core, tacking on extra groups or linking it to other substrates for more specific detection or efficiency. As someone who’s spent hours adapting assays and reading scientific journals, I see that progress starts with understanding a molecule’s core structure. The drive to upgrade diagnostics or streamline chemical reactions begins with knowing how pieces like the naphthalene ring and the phosphate group play together.
A single molecule often has ripples far beyond its lab bench origins. 1-Naphthyl phosphate, with its specific chemical bonds, shapes research, medicine, and practical life, all by virtue of how its atoms fall in line.
Every lab bench tells stories about forgotten bottles and unexpected spills. Over the years, I’ve learned that nothing stings like the moment you realize a compound has degraded—or, worse, escaped containment—because of poor storage decisions. 1-Naphthyl Phosphate may not headline the lists of hazardous chemicals, but taking its storage lightly risks a world of trouble.
To keep 1-Naphthyl Phosphate effective and safe, it helps to know a bit about its personality. It reacts to environmental factors such as moisture and light. Get careless with a lid, let it sit near humidity, and you’ll soon deal with decreased purity, clumped powder, or possible by-products. This kind of neglect turns a routine enzyme assay, staining, or research run into an expensive setback.
Every year, chemical disasters occur: the U.S. Chemical Safety Board reports dozens of laboratory fires and exposure events, often because basics like storage get ignored. Labs don’t need more reminders: proper storage preserves chemicals, but more importantly, it keeps people safe.
Clean, dry, and cool—those are the basics. Keep 1-Naphthyl Phosphate tucked in a tightly sealed glass or HDPE bottle. That cap matters: even a short exposure to air can introduce enough moisture to slowly break the compound down. Many labs make the mistake of using snap caps or leaving containers half-open while weighing powders. It doesn’t take long for the chemical to absorb enough water to start spoiling.
Tempers flare in a shared lab fridge, but putting enzyme substrates in a dedicated container keeps them away from food and drink. Most protocols call for cold storage, usually between 2°C and 8°C, but freezing below zero introduces more hassle than help—think capped bottles cracking or powders clumping in the frost. Choose a spot near the back of a refrigerator reserved for chemicals, labeled clearly, with a log sheet for opening and closing dates. Management may sound obsessive, but it saves time, money, and avoids headaches from mysterious brown stains on the bottle’s neck.
No lab avoids accidental spills forever. The right habits cut down on risk. Colored labeling works: I like a bright sticker screaming the hazard classification and storage temp. A secondary container, such as a rigid box, keeps leaks from spreading. Old habits from undergrad—like scribbling half-worn labels or skipping secondary containment—have no place if safety means anything.
Chemical incompatibility isn’t just for strong acids and bases. 1-Naphthyl Phosphate shouldn’t rub shoulders with strong oxidizers or acids. Segregation on shelves isn’t paranoia; it’s just learning from others’ mistakes. Many scientific suppliers note warnings in their safety data sheets, but too many folks breeze past those. I always take a few minutes to double-check the instructions or SDS before adding anything new to the chemical inventory.
Effective storage ties back to experience and common sense. Glove up, keep goggles handy, and clean spills right away—no half-hearted paper towel jobs. Well-maintained storage protects both the chemical and everyone who walks through the lab door. In the end, careful storage of 1-Naphthyl Phosphate lets research move forward and laboratories avoid those horror stories you hear at conferences but hope never happen in your own lab.
1-Naphthyl phosphate finds its way into many labs and research settings, often as part of biochemical assays. Researchers depend on it to help track phosphorus or measure enzyme activity. It works well in controlled environments, but handling always brings certain questions about health and safety. Many folks spend hours pipetting and mixing these solutions without a second thought, but some compounds demand a closer look beyond routine protocol.
This compound, with its roots in organic chemistry, looks harmless on paper. Open a bottle in a lab and the white powder appears quiet enough. The issue is, working with chemicals like 1-naphthyl phosphate means taking more than casual precautions. Skin contact, dust inhalation, or accidental splashes could bring more than just a nuisance. The parent compound, 1-naphthol, and related naphthalene substances have a history of irritating the skin and eyes. With enough exposure, some naphthalene-based molecules could even have links to larger health issues, including blood disorders or, in rare cases, cancer through chronic contact.
It’s not just the potential for immediate irritation either. Inhalation may seem unlikely with careful handling, but small powder particles find their way into the air with surprising ease. Once inside the lungs, some of these substances can cause headaches, dizziness, or worse. Some studies report that the phosphate group itself doesn’t add much toxicity, but breaking the compound down in the body or environment can release the underlying naphthyl moiety, which deserves more caution.
Chemicals don’t usually disappear after being poured down the drain. Labs across the world might only use a few grams each year, yet the buildup over time raises serious questions. Naphthalene derivatives often resist breakdown, sticking around in water or soil. Fish and other aquatic animals get exposed as the runoff makes its way into rivers or lakes. Even low concentrations can hurt these organisms, with some studies showing genetic changes and disrupted ecosystems. Unlike table salt or sugars, these chemicals don’t simply wash away.
Every responsible scientist learns to respect what they use. That means never assuming a chemical is safe just because it’s sold in bulk or used in basic protocols. Gloves, goggles, and solid lab ventilation aren’t negotiable. Training goes beyond reading the chemical’s safety sheet — it calls for a mindset that treats every bottle as a possible risk. Waste disposal counts just as much as careful handling. Flushing a solution down the sink might seem harmless, but better solutions exist. Treating waste at a chemical disposal facility protects both people and the environment long-term.
Institute policies matter, but personal responsibility plays an even bigger part. Sharing information and safe practices prevents silent mistakes. Substituting chemicals with greener alternatives, when possible, also helps cut down risks. In my own experience, small steps like switching to less hazardous reagents in enzyme assays turned out easier than expected — and no experiment's reliability suffered as a result. Good science thrives on both curiosity and caution.
1-Naphthyl phosphate certainly holds value in the lab, but it's not a risk-free ingredient. Developing safer protocols and exploring eco-friendlier substitutes will keep both researchers and the world outside the lab a little healthier. Real progress depends on understanding not just the value of discovery, but the long-term impact each compound leaves behind.
1-Naphthyl phosphate turns up a lot in the world of biology labs. I’ve worked with it in both teaching settings and research, mostly tied to enzyme assays. This stuff lets researchers track phosphatase activity—just about any experiment that involves measuring how proteins break down phosphate compounds. In my accounts, using the right concentration makes or breaks the clarity of your results.
The most common range floats between 0.1 to 5 mg/ml in aqueous solutions. Most protocols stick around 1 mg/ml or a little less if background signal gets in the way. In phosphatase assays, a final reaction concentration of 0.2–1 mM pops up over and over again in the literature and in my own binders of lab notes. This setup typically gives you a strong, measurable color signal that tracks closely with enzyme activity.
If you push up to 2 mM or even 5 mM, substrate won’t limit your reaction, but the background can get noisy. Too much 1-naphthyl phosphate will start to generate color even in blanks. Enzyme inhibitors or impurities mess things up faster as you go higher. On the flip side, using low concentrations—much below 0.1 mM—often dials down your readout past the point of usefulness, especially if your enzyme isn’t very active or if you’re trying to measure low-abundance proteins in crude lysates. It’s a balancing act between signal and noise.
Most commercial phosphatase kits settle in at 0.5 or 1 mM. In hands-on undergrad lab classes, I’ve watched students run into problems if their buffer or added substrate gets sloppy. Even a few microliters off makes your controls drift. Keeping substrate fresh and cold really helps as it can hydrolyze over time, throwing off results before the enzyme even hits the plate.
Some old protocols still go by weight, using 1 mg/ml as a standard, which is handy for quick college demonstrations but less precise for high-throughput screens. Nowadays, most peer-reviewed papers mention molar concentrations. This switch helps compare data across labs, since purity and hydration levels in chemicals vary between suppliers.
Digging through papers from sources such as the Journal of Biological Chemistry, researchers usually recommend doing a pilot run. Setting up a short concentration curve with your enzyme, picking three or four substrate points between 0.2 mM and 2 mM, then looking for where the color change gets linear. Labs working with tricky sample matrices sometimes aim at the lower end to keep non-specific reactions in check.
I learned that storing stock at 10-50 mM, frozen in aliquots, lets you make repeat batches with little fuss. Just dilute down in fresh buffer each day. Skipping this step leads to inconsistent results if your substrate has sat on the bench all week. It doesn’t take long for spontaneous breakdown and side reactions to creep in, especially in humid environments.
Accurate note-taking on substrate concentration, batch number, and date pays off. Comparing final readouts against a reliable standard, such as p-nitrophenol phosphate or a known enzyme activity, helps avoid mistakes. Because assays can be finicky, setting up proper blanks and including a gradient of substrate concentrations catches errors before they eat up precious samples.
People might chase bigger signals, but lower noise and clean backgrounds should guide the choice of concentration. By sticking within the 0.2–1 mM sweet spot and making sure reagents stay fresh, both teaching and research labs can trust their assay results without the headache of repeating everything later.
| Names | |
| Preferred IUPAC name | naphthalen-1-yl dihydrogen phosphate |
| Other names |
1-Naphthyl acid phosphate 1-Naphthyl Phosphoric Acid Phosphoric acid 1-naphthyl ester |
| Pronunciation | /waɪˈnæfθɪl fəˈsfeɪt/ |
| Identifiers | |
| CAS Number | 3331-78-8 |
| Beilstein Reference | 1439245 |
| ChEBI | CHEBI:75696 |
| ChEMBL | CHEMBL2106489 |
| ChemSpider | 68256 |
| DrugBank | DB02557 |
| ECHA InfoCard | 100.018.223 |
| EC Number | 3.1.3.1 |
| Gmelin Reference | Gmelin Reference: 288625 |
| KEGG | C01082 |
| MeSH | D009320 |
| PubChem CID | 68662 |
| RTECS number | WH1750000 |
| UNII | D96JZ8S1K8 |
| UN number | 3077 |
| CompTox Dashboard (EPA) | DTXSID00174086 |
| Properties | |
| Chemical formula | C10H9O4P |
| Molar mass | Molar mass: 238.19 g/mol |
| Appearance | White to off-white powder |
| Odor | Odorless |
| Density | 1.277 g/cm³ |
| Solubility in water | soluble |
| log P | 1.1 |
| Vapor pressure | Vapor pressure: Negligible |
| Acidity (pKa) | 7.2 |
| Basicity (pKb) | 12.08 |
| Dipole moment | 4.76 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 267.7 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | Std enthalpy of formation (ΔfH⦵298) of 1-Naphthyl Phosphate: -1372.7 kJ/mol |
| Pharmacology | |
| ATC code | V03AE02 |
| Hazards | |
| Main hazards | Harmful if swallowed. Causes serious eye irritation. Causes skin irritation. |
| GHS labelling | GHS05, GHS07 |
| Pictograms | GHS05,GHS07 |
| Signal word | Warning |
| Hazard statements | H302: Harmful if swallowed. |
| Precautionary statements | Precautionary statements: P264, P280, P302+P352, P305+P351+P338, P332+P313, P337+P313 |
| Lethal dose or concentration | LD50 Oral Rat 10000 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat LD50 > 5000 mg/kg |
| PEL (Permissible) | Not established |
| REL (Recommended) | 500 mg |
| IDLH (Immediate danger) | Not Listed |
| Related compounds | |
| Related compounds |
1-Naphthol 2-Naphthyl phosphate 2-Naphthol Phenyl phosphate |
