Bitter steroid glucosides, vernoniosides A1, A2, and A3, and related B1 from a possible medicinal plant, Vernonia amygdalina, used by wild chimpanzees.
摘要:
From Vernonia amygdalina, a possible medicinal plant used by wild chimpanzees, three bitter steroid glucosides, vernoniosides A1,A2 and A3 and a nonbitter vernonioside B1, were isoluted. The oxygenation patterns of the aglycone parts were new, especially the pattern of the carboxyl group at C21. The oxygen functionalities at C16 were important for the bitter taste.