A new anti-HIV lupane acid from Gleditsia sinensis Lam.

A new lupane acid, 2beta-carboxyl,3beta-hydroxyl-norlupA (1)-20 (29)-en-28-oic acid (1), together with five known lupane acid derivatives (2-6), were isolated from the stings of Gleditsia sinensis Lam.. Their structures were elucidated on the basis of 1D and 2D NMR techniques.