| Label | Id | |
|---|---|---|
| aconitine | 2430 | |
| acrifoline | 2433 | |
| acronidine | 2435 | |
| acronycidine | 2436 | |
| acronycine | 2437 | |
| acrophylline | 2438 | |
| acroptilin | 2439 | |
| acrovestone | 2440 | |
| actinidine | 2443 | |
| actinodaphnine | 2444 | |
| actinorhodin | 2448 | |
| acyclovir | 2453 | |
| adefovir | 2469 | |
| adenosylcobinamide | 2480 | |
| adhumulone | 143242 |