tertiary indole alkaloids dihydrocycloakagerine (1), 3, 14-dihydrodecussine (mostuenine)(3)
and tetrahydroakagerine (4), and the quaternary indole alkaloid isomalindine (5). The
structures of dihydrocycloakagerine (1) and isomalindine (5) are confirmed by the X-ray
method.