[chemical substances]
   compounds
     Class azanes [NnHn+2]
     1.1.1 Class hydrocarbons [CxHy] - compounds consisting of carbon and hydrogen only
     1.1.2 Class helicenes
     1.2.2.11 Class purine bases
     1.2.2.11 Class pyrimidine bases
     1.3 Class amidines [RnE(=NR)NR2]
     1.3.082.1 Class onium compounds
     1.3.084.3 Class acetylides [X+-C≡CH, X+-C≡C-+X, X+-C≡CR]
     1.3.201 Class alcohols [ROH (R≠H)]
     1.3.201 Class enols [R2C=CROH]
     1.3.202 Class phenols [ArOH]
     1.3.206 Class alkoxides [RO-M+]
     1.3.206 Class phenoxides [ArO-M+]
     1.3.211 Class ethers [ROR (R≠H)]
     1.3.218.2 Class peroxides [ROOR]
     1.3.301.1 Class aldehydes [RC(=O)H]
     1.3.311.1 Class ketones [R2C=O (R≠H)]
     1.3.317 Class quinones
     1.3.321 Class ketenes [R2C=C=O]
     1.3.331 Class acetals [R2C(OR')2 (R'≠H)] - diethers of geminal diols
     1.3.331.4 Class hemiacetals [R2C(OH)OR' (R'≠H)]
     1.3.332.1 Class acylals [R2C[OC(=O)R]2] - diesters of geminal diols
     1.3.333 Class acyloins [RCH(OH)C(=O)R]
     1.3.401.2 Class carboxylic acids - RC(=O)OH
     1.3.431 Class amic acids
     1.3.441.1 Class peroxy acids [acyl-OOH]
     1.3.451.1 Class hydrazonic acids [RkE(=O)l(OH)m (l≠0; ≥1 (=O):=(=NNR2))]
     1.3.451.1 Class hydroximic acids [RkE(=O)l(OH)m (l≠0; ≥1 (=O):=(=NOR))]
     1.3.451.1 Class imidic acids [RkE(=O)l(OH)m (l≠0; ≥1 (=O):=(=NR))]
     1.3.451.3 Class hydroxamic acids [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(NROR))]
     1.3.463 Class esters [acyl-XR, etc.; R'kE(=O)l(OH)m (l≠0; ≥1 (OH):=(XR)), etc.; X=O,S,Se,Te,etc.; R≠H]
     1.3.464 Class ortho acids [RC(OH)3] [hypothetical]
     1.3.475.1 Class lactams [~NRC(=O)[CR2]n~] - cyclic amides of amino carboxylic acids
     1.3.475.1 Class lactims [~N=C(OH)[CH2]n~]
     1.3.491 Class acid anhydrides [acyl-O-acyl]
     1.3.511.2 Class thiols [RSH (R≠H)]
     1.3.511.3 Class thiolates [RS-X+] - derivatives of thiols
     1.3.513.1 Class hydropolysulfides [RSnH (n>1)]
     1.3.514.1 Class sulfides [RSR (R≠H)]
     1.3.515 Class polysulfides [RSnR (n>1; R≠H)]
     1.3.515.2 Class polysulfanes [HSnH (n>1)]
     1.3.521.1 Class sulfenic acids [RSOH (R≠H)]
     1.3.531 Class thioaldehydes [RC(=S)H]
     1.3.532.2 Class thioketones [R2C=S (R≠H)]
     1.3.533.1 Class thioacetals
     1.3.533.2 Class thiohemiacetals
     1.3.541.1 Class thiocarboxylic acids
     1.3.543.5 Class thioanhydrides [acyl-S-acyl]
     1.3.631.1 Class sulfones [RS(=O)2R (R≠H)]
     1.3.631.1 Class sulfoxides [R2S=O (R≠H)]
     1.3.633.1 Class sulfimides [R2S=NR] - sulfimide and its hydrocarbyl derivatives
     1.3.633.1 Class sulfoximides [R2S(=O)=NR]
     1.3.641 Class sulfinic acids [RS(=O)OH] - sulfinic acid and its S-hydrocarbyl derivatives
     1.3.641 Class sulfonic acids [RS(=O)2OH] - sulfonic acid and its S-hydrocarbyl derivatives
     1.3.641.8 Class sulfenamides [RSNR'2 (R≠H)]
     1.3.641.8 Class sulfinamides [RS(=O)NR2] - amides of sulfinic acids
     1.3.641.9 Class sulfinamidines [RS(=NR)NR2] - amidines of sulfinic acids
     1.3.643.1 Class sulfinic anhydrides [RS(=O)OS(=O)R]
     1.3.643.1 Class sulfonic anhydrides [RS(=O)2OS(=O)2R]
     1.3.661.2 Class sulfamic acids [R2NS(=O)2OH] - sulfamic acid and its N-hydrocarbyl derivatives
     1.3.661.5 Class sulfinylamines [RN=S=O]
     1.3.661.5 Class sulfonylamines [RN=S(=O)2]
     1.3.671.1 Class sultones [~S(=O)2O[CH2]n~] - intramolecular cyclic esters of hydroxy sulfonic acids
     1.3.671.2 Class sultams [~S(=O)2NR[CH2]n~] - sulfonamides in which the S-N bond is part of a ring
     1.3.701 Class selenenic acids [RSeOH (R≠H)]
     1.3.701 Class seleninic acids [RSe(=O)OH]
     1.3.701 Class selenols [RSeH (R≠H)]
     1.3.701 Class selenones [R2Se(=O)2]
     1.3.701 Class selenonic acids [RSe(=O)2OH]
     1.3.701 Class selenoxides [R2Se=O (R≠H)]
     1.3.701 Class selones [R2C=Se (R≠H)]
     1.3.701.1 Class selenides [RSeR (R≠H)]
     1.3.701.2 Class tellurides [RTeR (R≠H)]
     1.3.701.2 Class tellurones [R2Te(=O)2]
     1.3.811.2 Class amines [RNH2, R2NH, R3N]
     1.3.815.3 Class imines [RN=CR2]
     1.3.816.5 Class picrates
     1.3.816.5 Class styphnates - salts or charge-transfer complexes of styphnic acid
     1.3.821 Class amides [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(NR2))]
     1.3.821 Class selenoamides [RC(=Se)NR2]
     1.3.821 Class telluroamides [RC(=Te)NR2]
     1.3.821 Class thioamides [RC(=S)NR2]
     1.3.826 Class diacylamines [acyl-NR-acyl]
     1.3.827 Class imides [acyl-NR-acyl]
     1.3.831.1 Class cyanides [X+[C≡N]‾, organyl-C≡N]
     1.3.833.1 Class cyanates [X+[OC≡N]‾, ROC≡N]
     1.3.833.1 Class isocyanates [RN=C=O]
     1.3.833.1 Class isocyanides [RNC; RN+≡C‾]
     1.3.833.1 Class isoselenocyanates [RN=C=Se]
     1.3.833.1 Class isothiocyanates [RN=C=S]
     1.3.833.1 Class selenocyanates [RSeCN] - salts and esters of selenocyanic acid
     1.3.833.1 Class thiocyanates [X+[SC≡N]‾, RSC≡N] - salts and esters of thiocyanic acid
     1.3.841 Class hydroxylamines [R2NOR]
     1.3.842.1 Class oximes [R2C=NOH]
     1.3.842.2 Class oxime O-ethers [R2C=NOR' (R'≠H)]
     1.3.851 Class nitroso compounds [RmXNO (X=C,N,O,etc.)]
     1.3.852.1 Class nitro compounds [RmXNO2 (X=C,N,O,etc.)]
     1.3.852.2 Class azinic acids [R2N+(O-)OH]
     1.3.852.2 Class azonic acids [RN+(O-)(OH)2]
     1.3.911 Class azo compounds [RN=NR (R≠H)]
     1.3.913 Class azo imides [RN=N(R)+-NR <-> RN-+N(R)=NR]
     1.3.913 Class azoxy compounds [RN=N+(O-)R]
     1.3.921.5 Class hydrazides [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(=NRNR2))]
     1.3.922 Class hydrazones [R2C=NNR2]
     1.3.923.1 Class azines [R2C=NN=CR2]
     1.3.931.3 Class diazoates [RN=NO‾M+]
     1.3.942 Class triazanes [NR2NRNR2] - triazane and its hydrocarbyl derivatives
     1.3.942.1 Class triazenes [NR2N=NR] - triazene and its hydrocarbyl derivatives
     1.3.942.2 Class diazoamino compounds [RN=NNR2 (not all R=H)]
     1.3.951.5 Class formamidine disulfides [R2NC(=NR)SSC(=NR)NR2]
     1.3.953 Class amidrazones [RC(=NH)NHNH2, RC(NH2)=NNH2]
     1.3.954.1 Class hydrazidines [RC(NRNR2)=NNR2]
     1.3.955.1 Class formazans [R2NN=CRN=NR]
     1.3.956 Class carbodiimides [RN=C=NR]
     1.3.971.2 Class ureides [H2NC(=O)[NHC(=O)]R or RC(=O)[NHC(=O)]2R] - N-acyl or N,N'-diacyl ureas
     1.3.972 Class isoureas [R2NC(=NH)OH]
     1.3.973.1 Class uronium salts [[ROC(=NR2)NR2]+X-] - salts of O-hydronated urea
     1.3.982 Class semicarbazones [R2C=NNHC(=O)NH2]
     1.4.5.04 Class phosphine oxides [R3P=O <-> R3P+O-]
     1.4.5.11 Class arsanes [AsnHn+2]
     1.4.5.11 Class arsines [R3As]
     1.4.5.11 Class bismuthanes [BinHn+2]
     1.4.5.11 Class bismuthines [R3Bi]
     1.4.5.11 Class phosphanes [PnHn+2]
     1.4.5.11 Class phosphines [R3P]
     1.4.5.11 Class stibanes [SbnHn+2]
     1.4.5.11 Class stibines [R3Sb]
     1.4.5.19 Class arsenides [R3As (≥1 H->M)]
     1.4.5.21 Class arsinous acids [R2AsOH]
     1.4.5.21 Class arsonous acids [RAs(OH)2]
     1.4.5.21 Class phosphinous acids [R2POH]
     1.4.5.21 Class phosphonous acids [RP(OH)2]
     1.4.5.41 Class arsine imides [R3As=NR]
     1.4.5.41 Class arsine oxides [R3As=O]
     1.4.5.41 Class arsine sulfides [R3As=S]
     1.4.5.51 Class arsinic acids [R2As(=O)OH]
     1.4.5.51 Class arsonic acids [RAs(=O)(OH)2]
     1.4.5.51 Class phosphinic acids [R2P(=O)OH]
     1.4.5.51 Class phosphonic acids [RP(=O)(OH)2]
     1.4.5.62 Class phosphoramides [P(=O)(NR2)3]
     1.4.5.65 Class phosphonitriles [[X2PN]n]
     1.4.5.71 Class arsoranes [R5As]
     1.4.5.71 Class phosphoranes [PR5]
     1.4.6.11 Class silanes [SinH2n+2]
     1.4.6.21 Class siloxanes [R3Si[OSiR2]nOSiR3]
     1.4.6.23 Class cyclosiloxanes [~[SiR2O]n~]
     1.4.6.31 Class silathianes [R3Si[SSiR2]nSSiR3]
     1.4.6.41 Class silazanes [R3Si[NHSiR2]nNHSiR3]
     1.4.6.42 Class cyclosilazanes [~[SiR2NH]n~]
     1.4.6.61 Class silasesquiazanes [(SiR)2n(NH)3n]
     1.4.6.61 Class silasesquioxanes [(SiR)2nO3n]
     1.4.6.61 Class silasesquithianes [(SiR)2nS3n]
     1.4.7.01 Class boranes [BxHy]
     1.4.7.42 Class borinic acids [R2BOH]
     1.4.7.42 Class boronic acids [RB(OH)2]
     2 Class carbohydrates [Cn(H2O)n, etc.]
     3 Class alkaloids
     3 Class chalcones [ArCH=CHC(=O)Ar]
     3 Class flavanols
     3 Class flavins [1≈NC(=O)NHC(=O)C(~2)=NC(≈3)CH=C(CH3)C(CH3)=CHC(≈3)NRC(~2)≈1]
     3 Class flavonoids
     3 Class isoflavonoids
     3 Class neoflavonoids
     3.048 Class peptides [H2NCH(R)C(=O)[NHCH(R)C(=O)]nOH]
     3.084 Class glycopeptides [carbohydrate-peptide]
     3.086 Class mucopolysaccharides
     3.109 Class nucleotides [HOP(=O)(OH)OCH2CH(O~)CH(OH)CH(Y)CH(base)~ (Y=H or OH)]
     3.110 Class nucleic acids [[─P(=O)(OH)OCH2CH(O~)CH(O─)CH(Y)CH(base)~]n (Y=H or OH)]
     3.110 Class nucleosides
     3.149 Class cyclitols
     3.151 Class inositols [~[CHOR]6~]
     3.180 Class lipids
     3.193.1 Class sterols
     3.193.2 Class steroids
     3.247 Class retinoids
     3.252 Class prenols [H[CH2C(CH3)=CHCH2]nOH; H[isoprene unit]nOH]
     3.255 Class isoprenoids
     3.272 Class corrinoids
     3.279 Class tetrapyrroles
     3.310 Class dipyrrins [pyrrole-CH=pyrrole]
     3.311 Class hemes and heme derivatives
     4 Class inclusion compounds