| Code | Name | Deposits | Targets | Ligand Type |
|---|---|---|---|---|
| CTS | castanospermine | 1 | 1 | biological |
| CL | chloride | 2 | 2 | modified residue |
| CL | chloride | 317 | 242 | crystallization |
| CL | chloride | 2 | 2 | biological |
| CL | chloride | 54 | 47 | other |
| CIR | citrulline | 1 | 1 | biological |
| CO | Cobalt | 1 | 1 | biological |
| COA | Coenzyme A | 1 | 1 | other |
| COA | Coenzyme A | 14 | 9 | biological |
| COA | Coenzyme A | 1 | 1 | crystallization |
| CVI | crystal violet | 1 | 1 | biological |
| OCS | cysteinesulfonic acid | 1 | 1 | other |
| CTP | cytidine-5'-phosphate | 1 | 1 | other |
| I22 | d-altro-hept-2-ulose 7-phosphate | 1 | 1 | biological |
| DME | decamethonium ion | 1 | 1 | crystallization |
| COD | dephospho coenzyme a | 1 | 1 | other |
| DEA | d-eritadenine | 1 | 1 | biological |
| DGL | d-glutamic acid | 1 | 1 | biological |
| NDB | Dimethyl(2 hydroxyethyl)ammonium propane sulfonate | 1 | 1 | crystallization |
| LMT | dodecyl-beta-d-maltoside | 1 | 1 | crystallization |