| Active principles | Rating | Bibliogr. | Expand | |
|---|---|---|---|---|
| 1 | Heterocyclic Compounds, 1-Ring | 100 | + | |
| 2 | Heterocyclic Compounds, 2-Ring | 91 | + | |
| 3 | Alkaloids | 32 | + | |
| 4 | Pyrans | 15 | + | |
| 5 | Heterocyclic Compounds with 4 or More Rings | 14 | + | |
| 6 | Heterocyclic Compounds, Bridged-Ring | 12 | + | |
| 7 | Heterocyclic Compounds, 3-Ring | 10 | + | |
| 8 | Acids, Heterocyclic | 5 | + | |
| 9 | Heterocyclic Oxides | 1 | + |