Six benzo[c]phenanthridine alkaloids, corynoline (1), acetylcorynoline (2),
corynoloxine (3), luguine (4), 6-oxocorynoline (5), and 12-hydroxycorynolo
xine (6) were isolated from the aerial parts of Corydalis incisa, and 6 was
isolated for the first time from nature. The structure was elucidated by N
MR techniques.