• Octanoic acid, 7-chloro-, chloromethyl ester
• 80418-69-5
• C₉H₁₆Cl₂O₂
• 227.128
• .

• Octanoic acid, 8-chloro-, chloromethyl ester
• 80418-70-8
• C₉H₁₆Cl₂O₂
• 227.128
• .

• Octadecanedioic acid, 7-butyl-, compd. with 2-amino-1-propanol
• 492426-68-3
• C₂₂H₄₂O₄·xC₃H₉NO
• .

• Octadecanedioic acid, 7-ethenyl-, compd. with 2-amino-1-propanol
• 492426-71-8
• C₂₀H₃₆O₄·xC₃H₉NO
• .

• Octane, 1-chloro-2-(2-chloroethoxy)-
• 80453-23-2
• C₁₀H₂₀Cl₂O
• .

• Oxacyclooctadec-10-en-2-one, (10Z)-
• 492442-74-7
• C₁₇H₃₀O₂
• .

• Oxacyclohexadec-13-ene-2,6-dione,4,8,12-trihydroxy-5,5,7,9,13-pentamethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-, (4S,7R,8S,9S,12R,13E,16S)-
• 492445-29-1
• C₂₇H₄₁NO₆S
• .

• Oxacyclohexadec-13-ene-2,6-dione,4,8,12-trihydroxy-5,5,7,9,13-pentamethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-, (4S,7R,8S,9S,12S,13E,16S)-
• 492445-32-6
• C₂₇H₄₁NO₆S
• .

• Oxacyclohexadec-13-ene-2,6-dione,13-(1,3-dithian-2-ylmethyl)-4,8-dihydroxy-5,5,7,9-tetramethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-, (4S,7R,8S,9S,13E,16S)-
• 492445-69-9
• C₃₁H₄₇NO₅S₃
• .

• Oxacyclohexadec-13-ene-2,6-dione,13-(hydroxymethyl)-5,5,7,9-tetramethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-4,8-bis[(trimethylsilyl)oxy]-, (4S,7R,8S,9S,13E,16S)-
• 492445-71-3
• C₃₃H₅₇NO₆SSi₂
• .

• Oxacyclohexadec-13-ene-2,6-dione,4,8-dihydroxy-13-(1H-imidazol-2-ylmethyl)-5,5,7,9-tetramethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-, (4S,7R,8S,9S,13E,16S)-
• 492445-75-7
• C₃₀H₄₃N₃O₅S
• .

• Oxacyclohexadec-13-ene-2,6-dione,13-(1,3-dithiolan-2-ylmethyl)-4,8-dihydroxy-5,5,7,9-tetramethyl-16-[(1E)-1-methyl-2-(2-methyl-4-thiazolyl)ethenyl]-, (4S,7R,8S,9S,13E,16S)-
• 492445-97-3
• C₃₀H₄₅NO₅S₃
• .

• Oxacyclohexadec-13-ene-2,6-dione,13-(1,3-dithiolan-2-ylmethyl)-4,8-dihydroxy-16-[(1E)-2-[2-(hydroxymethyl)-4-thiazolyl]-1-methylethenyl]-5,5,7,9-tetramethyl-,(4S,7R,8S,9S,13E,16S)-
• 492446-01-2
• C₃₀H₄₅NO₆S₃
• .

• Oxacyclohexadec-13-ene-2,6-dione,4,8-dihydroxy-16-[(1E)-2-[2-(hydroxymethyl)-4-thiazolyl]-1-methylethenyl]-13-(1H-imidazol-2-ylmethyl)-5,5,7,9-tetramethyl-,(4S,7R,8S,9S,13E,16S)-
• 492446-03-4
• C₃₀H₄₃N₃O₆S
• .

• Oxiranemethanol, 2-methyl-3-phenyl-, (2R,3R)-rel-
• 80523-18-8
• C₁₀H₁₂O₂
• .

• Oxonium, methylene(2,2,2-trifluoroethyl)-
• 492469-80-4
• C₃H₄F₃O
• .

• Oxazole, 2-(3,5-dinitrophenyl)-4,5-dihydro-
• 80640-90-0
• C₉H₇N₃O₅
• .

• Octadecanamide,N-[(2S)-3-methyl-2-[[(octadecylamino)carbonyl]amino]-1-oxobutyl]-
• 494209-28-8
• C₄₂H₈₃N₃O₃
• .

• Oxazole, 2-(2-bromophenyl)-4,5-dihydro-4-(1-methylethyl)-
• 885271-09-0
• C₁₂H₁₄BrNO
• .

• Oxirane, [[(4-methoxyphenyl)methoxy]methyl]-
• 80910-01-6
• C₁₁H₁₄O₃
• .

• Oxocane, 2-(methylthio)-2-(2-propenyl)-
• 886046-05-5
• C₁₁H₂₀OS
• .

• Oxocane, 2-(2-propenyl)-
• 886046-06-6
• C₁₀H₁₈O
• .

• O-[4-hydroxy-3-iodo-5-(~125~I)iodophenyl]-3,5-diiodo-L-tyrosine
• 80945-46-6
• C₁₅H₁₁I₃¹²⁵INO₄
• 774.8702
• .

• Oxepane, 2-hexyl-7-propyl-, (2S,7R)-
• 81053-62-5
• C₁₅H₃₀O
• .

• O-(4-bromo-2-chlorophenyl) S-propyl hydrogen phosphorothioate
• 81117-00-2
• C₉H₁₁BrClO₃PS
• 345.5776
• .

• Octadecanol, 1-(dodecyloxy)-
• 81132-82-3
• C₃₀H₆₂O₂
• .

• Octadecanoic acid, 10,13-dioxo-, methyl ester
• 81144-80-1
• C₁₉H₃₄O₄
• .

• Octadecanoic acid, 10,11-dimethyl-9,12-dioxo-, methyl ester
• 81144-81-2
• C₂₁H₃₈O₄
• .

• Octadecanoic acid, 11,12-dimethyl-10,13-dioxo-, methyl ester
• 81144-82-3
• C₂₁H₃₈O₄
• .

• Oxacyclopentacosan-2-one, 3-hydroxy-
• 81155-70-6
• C₂₄H₄₆O₃
• .

• Oxacycloheptacosan-2-one, 3-hydroxy-
• 81155-71-7
• C₂₆H₅₀O₃
• .

• Oxacyclopentacosan-2-one, 4-hydroxy-
• 81155-72-8
• C₂₄H₄₆O₃
• .

• Oxacycloheptacosan-2-one, 4-hydroxy-
• 81155-73-9
• C₂₆H₅₀O₃
• .

• Oxirane, 2,3-dihexyl-, (2R,3S)-rel-
• 81171-85-9
• C₁₄H₂₈O
• .

• Oxirane, 2,3-bis[(phenylmethoxy)methyl]-, (2S,3S)-
• 81177-24-4
• C₁₈H₂₀O₃
• .

• Oxathiiranethione
• 81202-15-5
• COS₂
• .

• O-phenyl N'',N'',N''',N'''-tetramethylphosphorodihydrazidothioate
• 81319-82-6
• C₁₀H₁₉N₄OPS
• 274.3228
• .

• Oxirane, 2-ethenyl-3-(2-phenylethyl)-, cis-
• 81411-51-0
• C₁₂H₁₄O
• .

• Oxirane, 2-(1-methylethenyl)-3-phenyl-, (2R,3S)-rel-
• 81411-53-2
• C₁₁H₁₂O
• .

• Oxazolidine, 2-(1-naphthalenyl)-4-[4-(phenylmethoxy)phenyl]-, (4R)-
• 891197-18-5
• C₂₆H₂₃NO₂
• .

• Oxirane,2-[4-methyl-2-(2-methylpropoxy)phenyl]-2-[(2-methylpropoxy)methyl]-
• 81427-00-1
• C₁₈H₂₈O₃
• .

• Octanal, 2-(phenylthio)-
• 81447-41-8
• C₁₄H₂₀OS
• .

• Orange G
• 81604-88-8
• Unspecified
• .

• Oxirane, octyl-, (2S)-
• 81623-66-7
• C₁₀H₂₀O
• .

• Ornithine, 2-(difluoromethyl)-, hydrochloride
• 81645-68-3
• C₆H₁₂F₂N₂O₂·xClH
• .

• Oxazolium, 3,4,5-triphenyl-, perchlorate
• 81650-39-7
• C₂₁H₁₆NO·ClO₄
• .

• Oxirane, (4-chlorobutyl)-
• 81724-56-3
• C₆H₁₁ClO
• .

• Octanoic acid,5-[[(1,1-dimethylethoxy)carbonyl]amino]-4-hydroxy-2,7-dimethyl-,2-propenyl ester, (2R,4S,5S)-
• 897664-28-7
• C₁₈H₃₃NO₅
• .

• Oxiranecarboxylic acid,3-[[[(1R)-3-methyl-1-[[(3-methylbutyl)amino]carbonyl]butyl]amino]carbonyl]-, (2S,3S)-
• 81739-93-7
• C₁₅H₂₆N₂O₅
• .

• Oxirane, [[2-(2-propenyl)phenoxy]methyl]-, (2S)-
• 81840-59-7
• C₁₂H₁₄O₂
• .