Calcium channel blockade in vascular smooth muscle cells: major hypotensive mechanism of S-petasin, a hypotensive sesquiterpene from Petasites formosanus - Wang,G.-J.; Shum,A.Y-C.; Lin,Y.-L.; Liao,J.-F.; Wu,X.-C.; Ren J et,a.l. (J Pharm Exp Therapeutics, 2001)