electron C19-steroid dicarboxylic acids and O-substituted derivatives metal oxide NAD NAD(P)H chlorofluorocarbon volatile organic compound titanium oxides glycol pyrrolopurine metalloid atom gas molecular entity carotenoid beta-end derivative chlorophyll(1-) chlorophyllide(2-) kaolin ultra-long-chain fatty acid ultra-long-chain fatty acid anion manganese dihydroxide manganese hydroxide electron donor acceptor acrolein water hydron dioxygen ATP argon-39 atom copper(II) phthalocyanine copper tetrapyrrole sarcosine primary alcohol GTP halide anion ammonia hydrogen sulfide methane sulfate urea hydroxide ethanol hydrogen peroxide chitosan nitrite hyaluronic acid pantothenate NADPH naphthalene carbon dioxide carbohydrate peptide soybean oil nucleoside 5'-phosphate benzene mineral nutrient glycan paralytic shellfish toxin formaldehyde chlorophyllide a NADH heteroglycan propane-1,2-diol chitin dinitrogen oxide fluoride ketone carbon monoxide nucleoside 5'-triphoshate testosterone aldehyde hydrogencarbonate alginic acid toluene beta-carotene nitrate electron acceptor methanol organohalogen compound hydrogen chloride donor ribonucleoside triphosphate chloride dinitrogen lipid glycosaminoglycan trimethylamine hydrogen halide polysaccharide chlorophyll a (1->4)-beta-D-glucan iron atom dihydrogen manganese atom alkane phosphate(3-) hydrogen cyanide sulfur dioxide inorganic calcium salt N-acylglucosamine N-acyl-hexosamine N-methyl-amino acid N-methylglycines acetamides adenosine phosphate alkaline earth metal atom alkali metal atom alkaloid alkyl group alkylamines aminoglycan anion arsenate ion arsenic molecular entity base benzenes benzoates benzopyrrole branched-chain amino acid bromine atom cadmium atom calcium atom calcium molecular entity carbamate ester carbon oxide carbonates carotene epoxycarotenoid carotenoid carotenol chloride salt chlorine atom chlorine molecular entity chromium molecular entity molecular entity copper molecular entity cyclic peptide diol drug monoatomic anion monoatomic cation enzyme inhibitor ethanols fluorine atom fluorine molecular entity glucosamines glycine derivative chemical entity biological role group guanidines guanosine phosphate halogen molecular entity halogen organic heterocyclic compound heterodetic cyclic peptide hexosamine hydrocarbon proton hydroxides hydroxybenzoate indoles oxoacid inorganic anion inorganic molecular entity inorganic oxide inorganic peroxide inorganic salt inorganic sulfate salt salt monoatomic ion ion iron molecular entity isoprenoid lead atom leucine magnesium atom magnesium molecular entity magnesium porphyrin manganese molecular entity metabolite metal cation metalloporphyrin methyl ester methylamines mitochondrial respiratory-chain inhibitor elemental molecule molecule monocarboxylic acid monohydroxybenzoate monoatomic monocation monoatomic polycation mutagen mycotoxin naphthalenes neoxanthin neurotransmitter NADP NAD(P) nicotinamide nucleotide nitrogen atom nitrous acid nonmetal atom nucleoside phosphate organic heteromonocyclic compound organic anion organic cation ether organic ion organic oxide organic phosphate aliphatic alcohol organophosphorus compound oxide oxygen atom oxygen molecular entity ozone aldopentose phosphate peroxides pesticide phosphate phosphoric acid derivative phosphorus molecular entity biological pigment polar amino acid polyester macromolecule polyol porphyrins potassium atom potassium molecular entity propane-1,2-diols propanediol purine nucleoside triphosphate purine nucleotide purine ribonucleoside triphosphate purine ribonucleotide purines pyridines quinate radical reactive oxygen species ribonucleotide ribose phosphate saturated fatty acid silicic acid silicon molecular entity sodium atom sodium chloride sodium molecular entity sodium salt carbohydrate phosphate sulfates sulfide sulfur atom sulfur molecular entity sulfuric acid terpenoid tertiary alcohol tetrapyrrole tetraterpenoid organic heterotricyclic compound threonine tin atom toluenes toxin micronutrient Anatoxin a transition element atom monoatomic trication organic heterobicyclic compound vanadium molecular entity very long-chain fatty acid violaxanthin xanthophyll xylene zinc atom zinc molecular entity methanesulfonic acid zeaxanthin boron atom arsenic atom silicon atom carbon atom cobalt atom detergent nitrobenzene acetamide chlorophyll b lead(0) chromium atom nickel atom alloxanthine alpha-carotene phosphorus atom molybdenum atom copper atom beta-D-glucan rubber particle lutein fatty acid anion ammonium amino sugar chlorophyll carbonic acid carboxylic acid anion mononucleotide arsenate(3-) hydrogen fluoride deuteron deuterium atom tritium atom silicate(4-) azanide monocarboxylic acid amide oxonium methanide hydrosulfide bacteriochlorophyll a gold(0) copper(0) lithium atom aluminium oxide photon alpha-particle helium atom helium-3 atom neutron positron isobutyl group monoatomic dication thallium sulfur hexafluoride silver atom antimony atom caesium atom silicon dioxide formic acid salicylate alcohol octacosanoic acid octacosanoate Talc titanium dioxide barium atom leucinate leucinium tertiary amine amine epoxide amide europium atom calcium carbonate application fundamental particle monoatomic entity coordination entity oxoacid derivative inorganic hydride organic fundamental parent organic group hydrocarbyl group organyl group atom monoatomic hydrogen atomic nucleus nucleon primary amide elemental molecular entity elemental hydrogen organosulfur compound elemental oxygen diatomic oxygen triatomic oxygen diatomic nitrogen elemental nitrogen polyatomic anion molecular messenger antimicrobial agent nutrient heteroorganic entity agrochemical fertilizer food fuel alkali metal molecular entity alkaline earth molecular entity pnictogen pnictogen molecular entity chalcogen chalcogen molecular entity carbon group element atom carboxylic ester noble gas atom monoatomic helium helium(2+) boron group element atom main group element atom lanthanoid atom rare earth metal atom strontium atom silicon oxide silicon oxoacid yttrium atom scandium group element atom lanthanum atom zinc group element atom titanium atom niobium atom titanium group element atom vanadium group element atom chromium group element atom manganese group element atom iron group element atom cobalt group element atom nickel group element atom copper group element atom cerium neodymium atom samarium atom gadolinium atom dysprosium atom platinum(0) sulfur oxoacid hydracid pnictogen oxoacid elemental carbon sulfur oxoacid derivative monoatomic monoanion elemental chlorine monoatomic chlorine monoatomic halogen elemental halogen phospho sugar nitrogen oxoacid nitrogen oxoanion pnictogen oxoanion phosphorus oxoanion elemental pnictogen sulfur oxoanion chalcogen oxoacid chalcogen oxoanion transition element molecular entity actinoid molecular entity uranium molecular entity metal atom sulfur hydride organosulfonic acid sulfonic acid derivative alpha-amino-acid anion s-block element atom p-block element atom d-block element atom f-block element atom carboxylic acid main group molecular entity boron group molecular entity carbon group molecular entity noble gas molecular entity lead molecular entity cyclic compound homocyclic compound carbocyclic compound hydrogen molecular entity aluminium molecular entity aluminium oxides monoatomic aluminium elemental aluminium polycyclic compound bicyclic compound ortho-fused compound olefin acyclic olefin alkadiene aliphatic compound aromatic compound arene organic aromatic compound monocyclic compound annulene cyclic hydrocarbon monocyclic hydrocarbon polycyclic hydrocarbon heteromonocyclic compound heteropolycyclic compound heterobicyclic compound zinc group molecular entity s-block molecular entity p-block molecular entity d-block molecular entity f-block molecular entity helium molecular entity elemental helium diatomic helium hydrides oxygen hydride biomacromolecule polyatomic cation amino-acid cation alpha-amino acid amino acid alpha-amino-acid cation chromium group molecular entity manganese group molecular entity iron group molecular entity copper group molecular entity vanadium group molecular entity nickel group molecular entity platinum molecular entity titanium group molecular entity organic hydroxy compound organic cyclic compound heteroarene benzenoid aromatic compound macromolecule aromatic annulene monocyclic arene polycyclic arene transition element coordination entity reagent metallotetrapyrrole macronutrient halide salt gold molecular entity elemental gold magnesium coordination entity saxitoxin nitrogen hydride azane aldose phosphate calcium salt cyclic carotene vanadium(0) elemental vanadium sulfate salt terpene tetraterpene surfactant nitrogen oxide tracer label alkaline earth coordination entity inhibitor fossil fuel ammonium ion derivative fused compound carbopolycyclic compound homopolycyclic compound ortho-fused polycyclic arene epoxycarotenol steroid 17beta-hydroxy steroid hydroxy steroid organonitrogen compound fatty acid chromium oxoanion chromium coordination entity chromate(2-) transition element oxoanion oxoanion ortho-fused bicyclic arene ortho-fused polycyclic hydrocarbon ortho-fused bicyclic hydrocarbon antiinfective agent alkali metal salt analgesic heterocyclic organic fundamental parent cardiovascular drug carbon oxoanion carbon oxoacid vasodilator agent secondary alcohol ester nitro compound C-nitro compound monocarboxylic acid anion arsenic oxoanion phosphate ion oxo steroid imidazopyrimidine pnictogen hydride hydroxy monocarboxylic acid anion inorganic chloride cyclitol carboxylic acid anion dicarboxylic acid monoester cyclic tetrapyrrole lepton baryon fermion boson subatomic particle composite particle hadron nuclear particle neutrino polyatomic entity polyatomic ion phosphorus oxoacid derivative phosphorus oxoacids and derivatives alkaline earth salt saturated organic heterocyclic parent saturated organic heteromonocyclic parent polycyclic ether main-group coordination entity carbonyl compound organic oxo compound organochlorine compound heterotricyclic compound carbobicyclic compound monoanion 17-hydroxy steroid inorganic radical radical cation radical ion inorganic radical ion inorganic radical cation elemental fluorine monoatomic fluorine chalcogen hydride neon molecular entity argon molecular entity krypton molecular entity inorganic ion inorganic cation cation carbon-14 atom carbon-13 atom nitrogen-15 atom chalcocarbonic acid organochalcogen compound organooxygen compound nucleotide pyridine nucleotide nicotinamide dinucleotide ribonucleoside 5'-phosphate amino-acid anion purine ribonucleoside 5'-triphosphate ribonucleoside 5'-triphosphate adenosine 5'-phosphate guanosine 5'-phosphate barium molecular entity elemental barium organofluorine compound glucan homopolysaccharide organic hydride mononuclear parent hydride silicon coordination entity silicon oxoanion elemental lead titanium molecular entity tropane alkaloid phosphorus oxide tetraphosphorus decaoxide mucopolysaccharide copper coordination entity elemental copper cyclic ether acid heteroatomic molecular entity halide allenes carboxamide phosphoric ester sulfuric acid derivative homopolymer macromolecule polypyrrole organonitrogen heterocyclic compound oxacycle organic heteropolycyclic compound polycyclic heteroarene bacteriochlorophyll chlorophyllide hydrocarbyl anion magnesium tetrapyrrole phorbines 2-amino-3-hydroxybutanoic acid azabicycloalkane methylindole electron-transport chain inhibitor respiratory-chain inhibitor pyrazolopyrimidine inorganic sodium salt quinolinemonocarboxylate anaesthetic general anaesthetic inhalation anaesthetic methylbenzene alkylbenzene Bronsted acid Bronsted base Lewis acid Lewis base chloropicrin straight-chain saturated fatty acid buta-1,3-diene butadiene cyclic ketone carbonate heptane hydrogenphosphate peridinin hydrogensulfate asbestos mineral silicate mineral chrysotile riebeckite crocidolite asbestos serpentine mineral tremolite asbestos amphibole asbestos amosite asbestos gruenerite serpentine asbestos anthophyllite anthophyllite asbestos actinolite actinolite asbestos sulfide mineral sulfide salt carbonate salt solvent silicon hydroxide dioxane dioxanes 1,4-dioxane acetate ester 3-oxo steroid indicator cyclic polypyrrole dinucleotide alkanesulfonic acid 3-oxo-Delta(4) steroid microcystin nitric acid nitrobenzenes silicate ion sulfur oxide antiseptic drug disinfectant polar solvent protic solvent protophilic solvent amphiprotic solvent antagonist aluminosilicate mineral elemental platinum aluminium(3+) argon atom hydrogen atom praseodymium atom uranium(0) zinc dichloride elemental krypton monoatomic krypton monoatomic argon elemental argon argon(.1+) monoatomic neon elemental neon organic amino compound sulfur coordination entity P450 inhibitor onium compound onium cation proteinogenic amino-acid side-chain group organic nitrogen anion androstanoid probe monoatomic uranium elemental uranium alkyl alcohol carbon nanotube nanostructure nanotube carbon nanostructure iron oxide organic molecular entity genotoxin allergen role neurotoxin tertiary amino compound nitrate salt inorganic nitrate salt chemical role nitrohydrocarbon nitroarene nitrogen molecular entity organic univalent group phthalocyanines metallophthalocyanines metallophthalocyanine enal enone alpha,beta-unsaturated aldehyde alpha,beta-unsaturated ketone fucoxanthin organic polycyclic compound organic tricyclic compound biochemical role biophysical role aetiopathogenetic role pharmacological role physiological role ligand pharmaceutical inorganic hydroxy compound epitope poly(alkylene) macromolecule polyethylene macromolecule vinyl polymer macromolecule poly(vinyl chloride) copolymer macromolecule poly(hydroxyalkanoate) poly(hydroxybutyrate) methyl cellulose poly(propylene) heterocyclic compound carbon monoxide(1+) chlorophyll a(1-) kynurenate cyclic tetrapyrrole anion very long-chain fatty acid anion saturated fatty acid anion straight-chain saturated fatty acid anion biomarker straight-chain fatty acid electrophilic reagent nucleophilic reagent chemical substance mixture polymer homopolymer poly(alkylene) polymer polyethylene polymer polyester polymer monovalent inorganic cation aluminium ion NMDA receptor antagonist polyurethane polymer excitatory amino acid antagonist amino monosaccharide nucleobase-containing molecular entity brevetoxin A ciguatoxin guanyl nucleotide adenyl nucleotide guanyl ribonucleotide adenyl ribonucleotide poly(ethylene terephthalate) polymer vinyl polymer polystyrene polymer signalling molecule reactive nitrogen species amorphous cellulose crystalline cellulose emulsifier aluminium cation oxidising agent carbohydrate derivative monosaccharide derivative pentose derivative branched-chain amino-acid anion 1,1-diol ketone hydrate food additive one-carbon compound organic acid trivalent inorganic cation poison polysaccharide derivative N-alkylglycine organic molecule exopolysaccharide divinyl chlorophyll a divinyl chlorophyll b eukaryotic metabolite animal metabolite mammalian metabolite prokaryotic metabolite iron sulfides iron(2+) sulfides greenhouse gas propellant EC 1.* (oxidoreductase) inhibitor EC 1.14.* (oxidoreductase acting on paired donors, with incorporation or reduction of molecular oxygen) inhibitor EC 3.* (hydrolase) inhibitor EC 3.5.* (hydrolases acting on non-peptide C-N bonds) inhibitor EC 3.5.1.* (non-peptide linear amide C-N hydrolase) inhibitor EC 1.14.14.* (oxidoreductase acting on paired donors, incorporating of 1 atom of oxygen, with reduced flavin or flavoprotein as one donor) inhibitor EC 1.14.14.1 (unspecific monooxygenase) inhibitor pathway inhibitor fungal metabolite bacterial metabolite human metabolite EC 3.5.1.4 (amidase) inhibitor raising agent food packaging gas food propellant fatty acid anion 28:0 food component environmental contaminant refrigerant carbohydrates and carbohydrate derivatives olefinic compound trivalent inorganic anion divalent inorganic anion monovalent inorganic anion Nodularin Peptidoglycan(N-acetyl-D-glucosamine) Brevetoxin B pheophytin diatomaceous earth elemental iron iron(0) crustacean metabolite Daphnia magna metabolite Daphnia metabolite chlorophyllide a(2-) N-acylammonia proteinogenic amino acid derivative non-proteinogenic amino acid amino acid derivative non-proteinogenic alpha-amino acid pentose phosphate pyrite metal allergen aromatic carboxylate skatole