**2.1 Benzophenanthridine**

Benzophenanthridine alkaloids (**1**–**51**) were isolated from *Zanthoxylum* species. Of these, nitidine (**1**), chelerythrine (**2**), and arnottianamide (**48**) were found in almost *Zanthoxylum* species (**Figure 2** and **Table 1**).
