| Label | Id | |
|---|---|---|
| butrin | 3244 | |
| carebastine | 192413 | |
| carnitinium | 3424 | |
| catecholate(1-) | 50524 | |
| catecholate(2-) | 32402 | |
| cefalotin | 124991 | |
| cefmetazole(1-) | 52439 | |
| cefonicid(2-) | 52441 | |
| cetoleate | 32429 | |
| cetrorelix | 59224 | |
| chlorofluorocarbon | 134024 | |
| chloropyrilene | 135246 | |
| chromane | 33224 | |
| chromophore | 23240 | |
| chrysen-2-ol | 132404 |