Bao gong teng A (BGT-A), a cholinergic tropane, was first separated from Erycibe obtusifolia Benth in China in 1978. 6 beta-Acetoxy nortropane (6 beta-AN), a new tropane analogue of BGT-A, was synthesized in 1983, in our university. Tropanes are generally known as M-cholinoceptor blockers, but 6