Studies on the constituents of the stems of Tinospora sinensis, II. . Isolation and structure elucidation of two new dinorditerpene glucosides, tinosineside A and B

Abstract Two new dinorditerpene glucosides, tinosineside A ( 1 ) and B (2‐O‐acetyltinosineside A, 2 ), were isolated from the fresh stems of Tinospora sinensis Merr. (Menispermaceae). Their structures were established on the basis of chemical and spectroscopic findings.