Studies on constituents of medicinal plants. XVIII. Constituents of the leaves of Clethra barbinervis Sieb. et Zucc.

Abstract
A new triterpene acid barbinervic acid (I) was isolated from the leaves of C. barbinervis Sieb. et Zucc. and barbinervic acid was elucidated as 3.alpha.,19.alpha.-24-trihydroxyurs-12-en-28-oic acid by chemical and spectral evidences. Rotundic acid was also isolated.