Structures of two new diterpenoid dimers from bulbs of Fritillaria ebeiensis
Wu, J.Z.; Ruan, H.L.; Zeng, C.L.; Cheng, H.A.; Zhang, F.; Zhao, Q.S.; Sun, H.D.; Fujita, T.
Journal of Asian Natural Products Research 1(4): 251-257
Two new ent-kauranoid diterpenoid dimers, fritillebin C (1) and fritillebin D (2), were isolated from the bulbs of Fritillaria ebeiensis G.D. Yu and G.Q. Ji. Their structures were determined to be ent-16beta-hydroxy-kauran-17-yl ent-16beta3-kauran-17-oate (1); ent-16alpha-hydroxy-kauran-17-yl ent-16beta-kauran-17-oate (2) by means of spectral analysis and chemical evidence.