[Analgesic effect and gastro-intestinal motility inhibitory action of 3-hydroxy-4-methoxy-acetophenone from Cynanchum paniculatum (Bunge) Kitagawa].

3-Hydroxy-4-methoxy-acetophenone (HMA) isolated from Cynanchum paniculatum was found to have analgesic effect and inhibitory action on the gastro-intestinal motility. The effect and action were equivalent to that of paeonol, HMA displayed a very low degree of antibacterial activity against Escherichia coli and Shigella flexneri.