the ca2+ channel blocker , nifedipine , a dihydropyridine derivative , inhibited the ca2+ influx and release from internal stores caused by collagen or a low concentration of the thromboxane a2 ( txa2 ) analogue , 9,11-epithio-11,12-methano-txa2 ( sta2 ) ( 10 nm ) , but did not inhibit those caused by thrombin or a high concentration of sta2 ( 100 nm ) .
C0028066
nifedipine
C0012315
dihydropyridine