Cephalezomines G, H, J, K, L, and M, new alkaloids from Cephalotaxus harringtonia var. Nana

Five new cephalotaxine-type alkaloids, cephalezomines G, H, J, K, and L (), and a new homoerythrina-type alkaloid, cephalezomine M (), have been isolated from the leaves of Cephalotaxus harringtonia var. nana. The relative and absolute stereochemistry was elucidated by NOESY data, CD analysis applying exciton chirality methods, and chemical means.