JPH0670013B

Novel 3-nitro-dihydropyridine derivatives of the formula in which R1 and R2 each independently is hydrogen, C1-C4-alkyl, C1-C12-alkoxy, C1-C4-halogenoalkoxy, halogen, nitro, C1-C4-halogenoalkyl, C1-C4-halogenoalkylmercapto, Z is oxygen or sulphur, R4 and R5 each independently is hydrogen, C1-C4-alkyl, C1-C6-alkoxy, halogen, C1-C4-halogenoalkyl, C1-C4-halogenoalkoxy or nitro, or R1 and R2, together with 2 C atoms of the phenyl ring form the ring X is oxygen or sulphur, A is a hydrocarbon radical with up to 12 C atoms which optionally contains one or two identical or different chain members from the group comprising O, S and CO and/or which is optionally substituted by hydroxyl or aliphatic acyloxy with up to 4 C atoms, R3 is -O-COR6, -S-CO-R6, SH, OH , NH2, NH-COR6, COOR6, NR7R8 or CONR7R8, R6 is hydrogen or an aliphatic radical with up to 6 C atoms or a phenyl radical, and R7 and R8 each independently is hydrogen or an aliphatic radical with up to 6 C atoms or a phenyl radical, or a physiologically acceptable salts thereof, which are active in circulation and exhibit positive inotropic activity.