contractions and 45ca2+ uptake in response to both depolarization and guanfacine were studied in the absence and presence of the calcium channel antagonists diltiazem , verapamil , nifedipine and the two stereoisomers of a 1,4-dihydropyridine derivative , namely the ( + ) - ( s ) enantiomer and the ( - ) - ( r ) enantiomer of 202-791 ( isopropyl 4- ( 2,1,3-benzoxadiazol-4-yl ) -1,4-dihydro-2,6-dimethyl-5-nitro-3- pyridinecarboxylate ) .
C0028066
nifedipine
C0012315
dihydropyridine