The structural elucidation of Fritillaria alkaloids from Fritillaria ebeiensis var. purpurea. I. The structures of ebeienine, ebeiedine and ebeiedinone - Lee,P.; Kitamura,Y.K.; Kaneko,K.; Shiro,M.; Xu,G.J.; Chen,Y.P. (Chem Pharm Bull, 1988)