Lactonic Carbazole Alkaloids from the Root Bark of Clausena excavata

Abstract

Examination of the extract from the root bark of Clausena excavata, yielded four new lactonic carbaczole alkaloids, clausevatine-D (1), -E (2), -F (3), -G (4), as well as the known clausamine-A (5). Their structures were elucidated by spectroscopic analyses.