| Label | Id | |
|---|---|---|
| Ala-tRNA(Ala) | 17732 | |
| Alantryphenone | 207364 | |
| Alanyl-Isoleucine | 173560 | |
| Alanyl-Lysine | 173625 | |
| Alanyl-Proline | 173889 | |
| Allylidenecyclohexane | 229273 | |
| Alnumycin | 220973 | |
| Amantamide | 209573 | |
| Angelicolide | 173263 | |
| Aniflorine | 2730 | |
| Anisessine | 2734 | |
| Anisodamine | 2735 | |
| Anisotine | 2738 | |
| Apotrichothecene | 173715 | |
| Aragusteroketal | 187381 |