| Label | Id | |
|---|---|---|
| Cer(t44:0) | 141733 | |
| Ceridimine | 141883 | |
| Chlorotrithiobrevamide | 214137 | |
| Clidanac | 31411 | |
| Clinofibrate | 31412 | |
| Clofenamide | 31418 | |
| Colchicoside | 81415 | |
| Conopharyngine | 141888 | |
| Corossoline | 176141 | |
| Corynantheidal | 141889 | |
| Corynantheidol | 141890 | |
| Corynantheine | 141891 | |
| Corynantheol | 141892 | |
| Criophylline | 141893 | |
| Cymoside | 141894 |