| Organic Acids | Not Available | 3 | 47 | Details |
| Organic Anion Transporter 1 Inhibitors | Not Available | 4 | 62 | Details |
| Organic Anion Transporters | A sub-family of sequence-related ORGANIC ANION TRANSPORTERS. | 1 | 0 | Details |
| Organic Anion Transporters, ATP-Dependent | A subclass of ORGANIC ANION TRANSPORTERS whose transport of organic anions is linked di... more | 1 | 0 | Details |
| Organic Anion Transporting Polypeptide 1B1 Inhibitors | Not Available | 17 | 202 | Details |
| Organic Anion Transporting Polypeptide 1B3 Inhibitors | Not Available | 14 | 172 | Details |
| Organic Anion Transporting Polypeptide 2B1 Inhibitors | Not Available | 53 | 935 | Details |
| Organic Cation Transporter 1 Inhibitors | Not Available | 2 | 29 | Details |
| Organic Nitrates | Not Available | 12 | 24 | Details |
| Organofluorophosphonates | A subclass of organophosphates that have a FLUORINE atom substituted for one of the OXY... more | 1 | 5 | Details |
| Organogold Compounds | Organic compounds that contain GOLD as an integral part of the molecule. Some are used ... more | 3 | 13 | Details |
| Organomercury Compounds | Organic compounds which contain mercury as an integral part of the molecule. | 7 | 27 | Details |
| Organometallic Compounds | A class of compounds of the type R-M, where a C atom is joined directly to any other el... more | 44 | 120 | Details |
| Organophosphates | Carbon-containing phosphoric acid derivatives. Included under this heading are compound... more | 16 | 54 | Details |
| Organophosphonates | Carbon-containing phosphonic acid compounds. Included under this heading are compounds ... more | 29 | 104 | Details |
| Organophosphorous Compounds | Not Available | 1 | 2 | Details |
| Organophosphorus Compounds | Organic compounds that contain phosphorus as an integral part of the molecule. Included... more | 104 | 330 | Details |
| Organoselenium Compounds | Organic compounds which contain selenium as an integral part of the molecule. | 4 | 8 | Details |
| Organosilicon Compounds | Organic compounds that contain silicon as an integral part of the molecule. | 11 | 8 | Details |
| Organotechnetium Compounds | Organic compounds that contain technetium as an integral part of the molecule. These co... more | 5 | 6 | Details |
| Organothiophosphates | Carbon-containing thiophosphoric acid derivatives. Included under this heading are comp... more | 8 | 17 | Details |
| Organothiophosphorus Compounds | Compounds containing carbon-phosphorus bonds in which the phosphorus component is also ... more | 10 | 20 | Details |
| Organotin Compounds | Organic compounds which contain tin in the molecule. Used widely in industry and agricu... more | 1 | 2 | Details |
| Oripavine Derivatives | Not Available | 1 | 14 | Details |
| Ornithine Decarboxylase Inhibitors | Substances and drugs that inhibit or block the activity of ORNITHINE DECARBOXYLASE. | 1 | 1 | Details |