bay k-8644 competitively displaced , ic50 = 1.8 nm , specific [ 3h ] nitrendipine binding to a microsome fraction derived from the umbilical artery , suggesting that the ca2+ channel activator and the structurally related dihydropyridine antagonists bind to a single site to affect ca2+ channel function in human vascular smooth muscle .
C0028127
nitrendipine
C0012315
dihydropyridine