Clausine-D and -F, two new 4-prenylcarbazole alkaloids from Clausena excavata

Abstract

Two new 4-prenylcarbazole alkaloids, clausine-D (1) and -F (3) were isolated from the stem bark of Clausena excavata. Their structures were elucidated by spectral methods. Both of clausine-D (1) and -F (3) showed significant antiplatelet aggregation activity.