Two New 8-Oxotetrahydroprotoberberine Alkaloids, Gusanlung A and B, fromAcangelisia gusanlung

Abstract
Two new 8-oxotetrahydroprotoberberine alkaloids, gusanlung A (1) and B (2), together with known isoquinoline alkaloids, berberine and jatrorrhizine, were isolated from the Chinese medicinal plant Acangelisia gusanlung H. S. Lo (Menispermaceae). Their structures were elucidated mainly by spectroscopic analysis.

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