| No. | CAS # | Product Names | Molecular Formula |
| 1 | 9046-10-0 | O,O'-Bis(2-aminopropyl)polypropyleneglycol | |
| 2 | 000-00-0 | O,O,O-triphenyl phosphorothioate | |
| 3 | 597-82-0 | O,O,O-triphenyl phosphorothioate | C18H15O3PS |
| 4 | 17321-47-0 | O,O-Dimethyl phosphoramidothioate | C2H8NO2PS |
| 5 | 136849-72-4 | O-((Ethoxycarbonyl)cyanomethyleneamino)-N,N,N',N'-tetramethyluronium tetrafluoroborate | C10H17N4O3.BF4 |
| 6 | 5080-50-2 | O-Acetyl-L-carnitine hydrochloride | C9H17NO4.HCl |
| 7 | 90-04-0 | o-anisidine | C7H9NO |
| 8 | 21615-34-9 | o-Anisoyl chloride | C8H7ClO2 |
| 9 | 698-16-8 | o-Chlorobenzaldoxime | C7H6ClNO |
| 10 | 6961-82-6 | o-Chlorobenzenesulfonamide | C6H6ClNO2S |
| 11 | 7134-04-5 | o-Cresolsulfonic acid | C7H8O4S |
| 12 | 95-48-7 | o-cresol | C7H8O |
| 13 | 947-84-2 | o-phenylbenzoic acid | C13H10O2 |
| 14 | 95-54-5 | o-phenylenediamine | C6H8N2 |
| 15 | 643-79-8 | o-Phthalaldehyde | C8H6O2 |
| 16 | 95-53-4 | o-Toluidine | C7H9N |
| 17 | 529-19-1 | o-Tolunitrile | C8H7N |
| 18 | 933-88-0 | o-Toluoyl chloride | C8H7ClO |
| 19 | 95-47-6 | o-xylene | C8H10 |
| 20 | 22352-19-8 | Octaacetyl-beta-maltose | C28H38O19 |
| 21 | 1843-05-6 | Octabenzone | C21H26O3 |
| 22 | 155613-93-7 | Octabromo-1,3,3-trimethyl-1-phenylindan | C18H12Br8 |
| 23 | 2234-13-1 | Octachloronaphthalene | C10Cl8 |
| 24 | 630-02-4 | Octacosane | C28H58 |
| 25 | 2885-00-9 | Octadecanethiol | C18H38S |
| 26 | 2082-79-3 | Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate | C35H62O3 |
| 27 | 4813-57-4 | Octadecyl acrylate | C21H40O2 |
| 28 | 10361-12-3 | Octadecyl gallate | C25H42O5 |
| 29 | 930-02-9 | Octadecyl vinyl ether | C20H40O |
| 30 | 3069-42-9 | Octadecyltrimethoxysilane | C21H46O3Si |
| 31 | 115-25-3 | Octafluorocyclobutane | C4F8 |
| 32 | 76-19-7 | octafluoropropane | C3F8 |
| 33 | 15687-40-8 | Octafonium chloride | C27H42ClNO |
| 34 | 125756-69-6 | Octakis(dimethylsiloxy)-T8-silsequioxane | C16H56O20Si16 |
| 35 | 556-67-2 | Octamethylcyclotetrasiloxane | C8H24O4Si4 |
| 36 | 546-56-5 | Octaphenylcyclotetrasiloxane | C48H40O4Si4 |
| 37 | 6197-30-4 | Octocrilene | C24H27NO2 |
| 38 | 770-05-8 | Octopamine hydrochloride | C8H11NO2.HCl；C8H12ClNO2 |
| 39 | 83150-76-9 | Octreotide acetate | C49H66N10O10S2.2(C2H4O2) |
| 40 | 3147-75-9 | Octrizole | C20H25N3O |
| 41 | 1928-44-5 | Octyl (2,4-dichlorophenoxy)acetate | C16H22Cl2O3 |
| 42 | 5466-77-3 | Octyl 4-methoxycinnamate | C18H26O3 |
| 43 | 112-32-3 | octyl formate | C9H18O2 |
| 44 | 1034-01-1 | Octyl gallate | C15H22O5 |
| 45 | 6969-49-9 | Octyl salicylate | C15H22O3 |
| 46 | 125643-61-0 | Octyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate | C25H42O3 |
| 47 | 4956-37-0 | Oestradiol 17-heptanoate | C25H36O3 |
| 48 | 82419-36-1 | OFLOXACIN | |
| 49 | 58810-48-3 | Ofurace | C14H16ClNO3 |
| 50 | 000000-00-0 | Oil-based disperse colour paste |