| o-Chlorothiophenol | C₆H₅ClS | 144.626 g/mol |
| O-Cresol | C₇H₈O | 108.14 g/mol |
| o-CRESYL GLYCIDYL ETHER | C₁₀H₁₂O₂ | 164.204 g/mol |
| O-cyclohexylhydroxylamine | C₆H₁₃NO | 115.176 g/mol |
| O-Demethylmetoprolol | C₁₄H₂₃NO₃ | 253.342 g/mol |
| o-Desethyl sildenafil | C₂₀H₂₆N₆O₄S | 446.533 g/mol |
| o-Desmethyl metoclopramide | C₁₃H₂₀ClN₃O₂ | 285.775 g/mol |
| O-ethoxycarbonyl-2,3,4-trifluoro-5-nitrophenol | C₉H₆F₃NO₅ | 265.143 g/mol |
| O-ethyl 4-amino-2-methylpyrimidine-5-carbothioate | C₈H₁₁N₃OS | 197.263 g/mol |
| O-ethyl S-n-propyl O-(4-bromo-2-fluorophenyl) thiophosphate | C₁₁H₁₅BrFO₃PS | 357.181 g/mol |
| O-Ethyl S-propyl chlorothiophosphate | C₅H₁₂ClO₂PS | 202.643 g/mol |
| O-Ethyl S-Propyl O-(2-Formylphenyl) Thiophosphate | C₁₂H₁₇O₄PS | 288.305 g/mol |
| O-Ethyl S-propyl O-(4-formylphenyl) thiophosphate | C₁₂H₁₇O₄PS | 288.305 g/mol |
| O-ethyl S-propyl O-(7-methoxyindan-1-on-4-yl) thiophosphate | C₁₅H₂₁O₅PS | 344.369 g/mol |
| O-Ethyl S-Propyl O-[2-(Benzoylhydrazonomethyl)phenyl] Thiophosphate | C₁₉H₂₃N₂O₄PS | 406.444 g/mol |
| O-ethyl S-propyl O-[4-(benzoylhydrazonomethyl)phenyl] thiophosphate | C₁₉H₂₃N₂O₄PS | 406.444 g/mol |
| O-Ethylvanillin | C₉H₁₀O₃ | 166.176 g/mol |
| o-Fluoroacetophenone | C₈H₇FO | 138.141 g/mol |
| o-Fluorobenzaldehyde | C₇H₅FO | 124.114 g/mol |
| o-Fluorocinnamic acid | C₉H₇FO₂ | 166.151 g/mol |
| o-Fluorostyrene | C₈H₇F | 122.142 g/mol |
| o-Hydroxymethylphenoxy methylstyrene | C₁₆H₁₆O₂ | 240.302 g/mol |
| o-Hydroxyphenyl benzoate | C₁₃H₁₀O₃ | 214.22 g/mol |
| o-Iodoanisole | C₇H₇IO | 234.036 g/mol |
| o-Iodohippuramide | C₉H₉IN₂O₂ | 304.087 g/mol |
| o-Iodonitrobenzene | C₆H₄INO₂ | 249.007 g/mol |
| o-Iodophenylacetyl chloride | C₈H₆ClIO | 280.492 g/mol |
| O-Isobutylhydroxylamine | C₄H₁₁NO | 89.138 g/mol |
| o-Isobutylstyrene | C₁₂H₁₆ | 160.26 g/mol |
| O-isopropyl-N,N'-dicyclohexyl-isourea | C₁₆H₃₀N₂O | 266.429 g/mol |
| o-Methoxycarbonyl-alpha-[4-(4-methoxybenzoyl)-1-piperazinyl]acetanilide | C₂₂H₂₅N₃O₅ | 411.458 g/mol |
| O-methyl 2-hexyldecanethioate | C₁₇H₃₄OS | 286.525 g/mol |
| O-methyl 2-methyl-3-[4-[(1-methyl-6-methylsulfanylbenzimidazol-2-yl)methoxy]phenyl]propanethioate | C₂₁H₂₄N₂O₂S₂ | 400.569 g/mol |
| O-methyl 5-amino-6-methylpyridine-3-carbothioate | C₈H₁₀N₂OS | 182.248 g/mol |
| O-methyl ethanethioate | C₃H₆OS | 90.147 g/mol |
| O-methyl S-ethyl O-(4-formylphenyl) thiophosphate | C₁₀H₁₃O₄PS | 260.251 g/mol |
| O-methyl S-ethyl O-[4-(3-chlorobenzoylhydrazonomethyl)phenyl] thiophosphate | C₁₇H₁₈ClN₂O₄PS | 412.835 g/mol |
| O-methyl-N-[1-(2,2,4-trimethyl-cyclohex-3-enyl)-ethyl]-hydroxylamine | C₁₂H₂₃NO | 197.322 g/mol |
| O-Methylhydroxylamine | CH₅NO | 47.057 g/mol |
| O-Methylisourea | C₂H₆N₂O | 74.083 g/mol |
| O-Methyltyramine | C₉H₁₃NO | 151.209 g/mol |
| o-N,N-Diethylsulfamoylbenzenesulfonyl isocyanate | C₁₁H₁₄N₂O₅S₂ | 318.376 g/mol |
| o-Nitrobenzylideneacetoacetic isopropylamide | C₁₄H₁₆N₂O₄ | 276.292 g/mol |
| o-Orsellinaldehyde | C₈H₈O₃ | 152.149 g/mol |
| O-p-Chlorophenyl chlorothioformate | C₇H₄Cl₂OS | 207.081 g/mol |
| o-Phenethylbenzoic acid | C₁₅H₁₄O₂ | 226.275 g/mol |
| o-Phenetidine | C₈H₁₁NO | 137.182 g/mol |
| o-Phenoxybenzaldehyde | C₁₃H₁₀O₂ | 198.221 g/mol |
| o-Phenoxybenzyl iodide | C₁₃H₁₁IO | 310.134 g/mol |
| o-Phenylbenzoic acid | C₁₃H₁₀O₂ | 198.221 g/mol |
| O-Phenylenediamine | C₆H₈N₂ | 108.144 g/mol |
| O-Phenylhydroxylamine | C₆H₇NO | 109.128 g/mol |
| O-Piperidin-4-yl-hydroxylamine | C₅H₁₂N₂O | 116.164 g/mol |
| O-propylhydroxylamine | C₃H₉NO | 75.111 g/mol |
| O-tert-Butyl-DL-serine | C₇H₁₅NO₃ | 161.201 g/mol |
| O-tert-butylhydroxylamine | C₄H₁₁NO | 89.138 g/mol |
| o-Toluenesulfonyl chloride | C₇H₇ClO₂S | 190.651 g/mol |
| o-Toluenesulfonyl chloride, 5-nitro- | C₇H₆ClNO₄S | 235.648 g/mol |
| O-Toluidine | C₇H₉N | 107.156 g/mol |
| o-Tolyl 2-methoxy-3-(1-propenyl)phenyl ether | C₁₇H₁₈O₂ | 254.329 g/mol |
| o-Tolyl 2-methoxy-3-allylphenyl ether | C₁₇H₁₈O₂ | 254.329 g/mol |
| o-Tolyl-acetyl chloride | C₉H₉ClO | 168.623 g/mol |
| o-Tolylacetic acid | C₉H₁₀O₂ | 150.177 g/mol |
| O-tosyl-6-tritylaminohexanol | C₃₂H₃₅NO₃S | 513.703 g/mol |
| o-Vanillin | C₈H₈O₃ | 152.149 g/mol |
| O-Xylene | C₈H₁₀ | 106.168 g/mol |
| o-Xylene-3,alpha,alpha'-triol | C₈H₁₀O₃ | 154.165 g/mol |
| o-Xylyl bromide | C₈H₉Br | 185.064 g/mol |
| O1-benzyl O2-methyl 4-fluoropyrrolidine-1,2-dicarboxylate | C₁₄H₁₆FNO₄ | 281.283 g/mol |
| O1-benzyl O2-methyl 4-methylenepyrrolidine-1,2-dicarboxylate | C₁₅H₁₇NO₄ | 275.304 g/mol |
| O5-benzyl O6-methyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate | C₁₆H₁₉NO₄ | 289.331 g/mol |
| O5-tert-butyl O2-ethyl 1-methyl-6,7-dihydro-4H-pyrrolo[3,2-c]pyridine-2,5-dicarboxylate | C₁₆H₂₄N₂O₄ | 308.378 g/mol |
| O=[N+]([O-])c1c[nH]cn1 | C₃H₃N₃O₂ | 113.076 g/mol |
| O=[N+]([O-])c1cnc(O)c(C(F)(F)F)c1 | C₆H₃F₃N₂O₃ | 208.095 g/mol |
| O=C(NC1CCCCC1)NS(=O)(=O)c1ccc(CCn2cnc3ccccc3c2=O)cc1 | C₂₃H₂₆N₄O₄S | 454.552 g/mol |
| O=C(O)c1ccc2[nH]cnc2c1 | C₈H₆N₂O₂ | 162.148 g/mol |
| O=C(O[IH2](OC(=O)C(F)(F)F)c1ccccc1)C(F)(F)F | C₁₀H₅F₆IO₄ | 430.038 g/mol |
| O=c1[nH]cnc2sccc12 | C₆H₄N₂OS | 152.178 g/mol |
| O=c1ccc(Cl)c[nH]1 | C₅H₄ClNO | 129.546 g/mol |
| O=c1ccc(Cl)n[nH]1 | C₄H₃ClN₂O | 130.534 g/mol |
| O=c1ccc2cccc(O)c2[nH]1 | C₉H₇NO₂ | 161.16 g/mol |
| O=c1cccc[nH]1 | C₅H₅NO | 95.101 g/mol |
| O=c1cnc2ccccc2[nH]1 | C₈H₆N₂O | 146.149 g/mol |
| O=c1nccc[nH]1 | C₄H₄N₂O | 96.089 g/mol |
| O=Cc1cnc[nH]1 | C₄H₄N₂O | 96.089 g/mol |
| Oc1ccc(Br)cn1 | C₅H₄BrNO | 173.997 g/mol |
| Oc1ccc(CCCCc2nnn[nH]2)cc1 | C₁₁H₁₄N₄O | 218.26 g/mol |
| Oc1ncc(Cl)cc1Br | C₅H₃BrClNO | 208.442 g/mol |
| Oc1ncnc2ccccc12 | C₈H₆N₂O | 146.149 g/mol |
| Oct-2-enoic acid | C₈H₁₄O₂ | 142.198 g/mol |
| Oct-4-enedioic acid | C₈H₁₂O₄ | 172.18 g/mol |
| Oct-7-en-1-ol | C₈H₁₆O | 128.215 g/mol |
| Oct-7-en-1-ylbenzene | C₁₄H₂₀ | 188.314 g/mol |
| Octadeca-10,13-dienoyl chloride | C₁₈H₃₁ClO | 298.898 g/mol |
| Octadeca-6,9,12-trien-1-ol | C₁₈H₃₂O | 264.453 g/mol |
| Octadeca-6,9,12-trienal | C₁₈H₃₀O | 262.437 g/mol |
| Octadeca-6,9,12-trienoic acid | C₁₈H₃₀O₂ | 278.436 g/mol |
| Octadeca-6,9,12-trienoyl chloride | C₁₈H₂₉ClO | 296.882 g/mol |
| Octadeca-9,12-dienyl methanesulfonate | C₁₉H₃₆O₃S | 344.561 g/mol |
| Octadecanal | C₁₈H₃₆O | 268.485 g/mol |