radioligand binding studies using [ 3h ] nitrendipine and [ 3h ] diltiazem showed that the compound with the free nitrogen binds competitively into the dihydropyridine binding site while the molecule in which the nitrogen is alkylated with a ( dimethylamino ) ethyl group interacts competitively with both diltiazem and dihydropyridine binding sites .
C0028127
nitrendipine
C0012315
dihydropyridine