Table 1
Chemical structures and common names of some biogenic β-carboline alkaloids
 |  |  | ||
|---|---|---|---|---|
| R1 | R2 | |||
| H | H | Tryptoline | Norharmalan | Norharman |
| H | 6-CH3O | Pinoline | 6-CH3O-dihydro-β-carboline | 6-CH3O-β-carboline |
| CH3 | H | Tetrahydroharman | Harmalan | Harman |
| CH3 | 7-CH3O | Tetrahydroharmine | Harmaline | Harmine |