| Active principles | Rating | Bibliogr. | Expand | |
|---|---|---|---|---|
| 1 | Indoles | 100 | + | |
| 2 | Pyrrolizidine Alkaloids | 99 | + | |
| 3 | Purines | 84 | + | |
| 4 | Isoquinolines | 64 | + | |
| 5 | Benzopyrans | 48 | + | |
| 6 | Benzimidazoles | 41 | + | |
| 7 | Quinazolines | 33 | + | |
| 8 | Benzothiadiazines | 26 | + | |
| 9 | Benzazepines | 15 | + | |
| 10 | Isoindoles | 10 | + | |
| 11 | Pteridines | 6 | + | |
| 12 | Quinoxalines | 6 | + | |
| 13 | Quinolines | 4 | + |