| Code | Name | Deposits | Targets | Ligand Type |
|---|---|---|---|---|
| CP | carbamoyl phosphate | 2 | 1 | biological |
| CPS | 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfona te | 2 | 2 | crystallization |
| CRY | propane-1,2,3-triol | 1 | 1 | other |
| CS | 2 | 1 | biological | |
| CS | 2 | 1 | crystallization | |
| CSA | 1 | 1 | modified residue | |
| CSD | 1 | 1 | modified residue | |
| CSO | S-HYDROXYCYSTEINE | 2 | 2 | biological |
| CSO | S-HYDROXYCYSTEINE | 2 | 2 | crystallization |
| CSO | S-HYDROXYCYSTEINE | 3 | 3 | modified residue |
| CSX | 6 | 6 | modified residue | |
| CSZ | s-selanyl cysteine | 1 | 1 | modified residue |
| CTO | triacetylchitotriose | 1 | 1 | biological |
| CTP | cytidine-5'-phosphate | 1 | 1 | other |
| CTS | castanospermine | 1 | 1 | biological |
| CU | 3 | 3 | biological | |
| CVI | crystal violet | 1 | 1 | biological |
| CXS | 3-cyclohexyl-1-propylsulfonic acid | 2 | 2 | crystallization |
| CYT | 6-aminopyrimidin-2(1h)-one | 1 | 1 | other |
| D67 | 1 | 1 | biological |