| Oxazines | Six-membered heterocycles containing an oxygen and a nitrogen. | 106 | 644 | Details |
| Oxazocines | One ring heterocyclic compounds defined by C6H7NO. Permitted are any degree of hydrogen... more | 1 | 7 | Details |
| Oxazol, Thiazine, and Triazine Derivatives | Not Available | 2 | 9 | Details |
| Oxazoles | Five-membered heterocyclic ring structures containing an oxygen in the 1-position and a... more | 71 | 174 | Details |
| Oxazolidine Derivatives | Not Available | 3 | 14 | Details |
| Oxazolidinone Antibacterial | Not Available | 3 | 12 | Details |
| Oxazolidinones | Derivatives of oxazolidin-2-one. They represent an important class of synthetic antibio... more | 6 | 18 | Details |
| Oxepins | Compounds based on a 7-membered heterocyclic ring including an oxygen. They can be cons... more | 0 | 0 | Details |
| Oxicams | Not Available | 5 | 29 | Details |
| Oxidants | Electron-accepting molecules in chemical reactions in which electrons are transferred f... more | 8 | 25 | Details |
| Oxidants, Photochemical | Compounds that accept electrons in an oxidation-reduction reaction. The reaction is ind... more | 1 | 3 | Details |
| Oxidation-Reduction Activity | Not Available | 1 | 2 | Details |
| Oxidation-Reduction Agent | Not Available | 3 | 27 | Details |
| Oxidative Phosphorylation Coupling Factors | Not Available | 2 | 6 | Details |
| Oxides | Binary compounds of oxygen containing the anion O(2-). The anion combines with metals t... more | 24 | 80 | Details |
| Oxidoreductases | The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxi... more | 8 | 9 | Details |
| Oxidoreductases Acting on Aldehyde or Oxo Group Donors | A broad category of oxidoreductases that either reduce double bonds or oxidize single b... more | 1 | 2 | Details |
| Oxidoreductases Acting on CH-NH Group Donors, antagonists & inhibitors | Not Available | 1 | 1 | Details |
| Oximes | Oximes derived from KETONES. | 4 | 15 | Details |
| Oxygen Compounds | Inorganic compounds that contain oxygen as an integral part of the molecule. | 33 | 99 | Details |
| Oxygenases | Oxidases that specifically introduce DIOXYGEN-derived oxygen atoms into a variety of or... more | 1 | 1 | Details |
| Oxysterols | Oxygenated derivatives of cholesterol or its sterol precursors. They are generated from... more | 4 | 6 | Details |
| Oxytocin and Analogues | Not Available | 3 | 9 | Details |
| Oxytocin, analogs & derivatives | Not Available | 1 | 8 | Details |
| Oxytocin, antagonists & inhibitors | Not Available | 0 | 0 | Details |