| Code | Name | Deposits | Targets | Ligand Type |
|---|---|---|---|---|
| CEX | alpha-d-glucopyranosyl-(1->4)-alpha-d-glucopyranosyl-(1->4)-alpha-d-glucopyranosyl-(1->4)-alpha-d-glucopyranos yl-(1->4)-alpha-d-glucopyranose | 1 | 1 | biological |
| CIR | citrulline | 1 | 1 | biological |
| CIT | 1 | 1 | biological | |
| 3DS | (4s,5r)-4,5-dihydroxy-3-oxocyclohex-1-ene-1-carboxylic acid | 2 | 1 | biological |
| CIT | 1 | 1 | other | |
| ACT | 1 | 1 | modified residue | |
| 3GR | glyceraldehyde | 1 | 1 | other |
| CSA | 1 | 1 | modified residue | |
| ACX | alpha-cyclodextrin (cyclohexa-amylose) | 1 | 1 | other |
| CME | 1 | 1 | crystallization | |
| ACY | 1 | 1 | biological | |
| CMP | adenosine-3',5'-cyclic-monophosphate | 1 | 1 | biological |
| CO | Cobalt | 1 | 1 | biological |
| CO3 | carbonate ion | 1 | 1 | crystallization |
| CO8 | octanoyl-coenzyme a | 1 | 1 | biological |
| 537 | 2,6-dihydroanthra/1,9-cd/pyrazol-6-one | 1 | 1 | crystallization |
| COA | Coenzyme A | 1 | 1 | crystallization |
| COA | Coenzyme A | 1 | 1 | other |
| COD | dephospho coenzyme a | 1 | 1 | other |
| GUN | guanine | 1 | 1 | biological |