| Code | Name | Deposits | Targets | Ligand Type |
|---|---|---|---|---|
| ZN | zinc | 12 | 12 | other |
| ZN | zinc | 9 | 9 | crystallization |
| ZN | zinc | 106 | 44 | biological |
| X77 | X77 | 1 | 1 | biological |
| UD1 | uridine-diphosphate-n-acetylglucosamine | 1 | 1 | biological |
| EPU | uridine-diphosphate-2(n-acetylglucosaminyl) butyric aci d | 2 | 2 | biological |
| U5P | uridine-5'-monophosphate | 2 | 2 | biological |
| UVC | uridine-2',3'-vanadate | 1 | 1 | biological |
| URI | uridine | 1 | 1 | biological |
| URE | urea | 1 | 1 | crystallization |
| URA | uracil | 1 | 1 | other |
| UNX | Unknown atom | 9 | 3 | crystallization |
| UNX | Unknown atom | 4 | 2 | other |
| UNX | Unknown atom | 2 | 2 | biological |
| L30 | unknown | 2 | 1 | biological |
| bpa | unknown | 1 | 1 | crystallization |
| MPD | unknown | 15 | 11 | crystallization |
| DT | unknown | 3 | 2 | biological |
| DA | unknown | 3 | 2 | biological |
| G | unknown | 1 | 1 | biological |