Drofenine HCl is a potent competitive inhibitor of BChE, and the ki values of drofenine is calculated to be 3 μM.

(+)-Pteryxin, a natural product isolated and purified from the herbs of Peucedanum harry-smithii var. subglabrum, has muscle-relaxant property and shows hepatoprotective and nitric oxide prodn. inhibitory activity.