| 摘要 |
The compounds of formula (I) wherein R1 and R2 are, independently, hydrogen, straight or branched chain alkyl or mono- or bi-cyclic alkyl; A is an Nheterocycle which may be substituted by alkyl, perfluoroalkyl, alkoxy, perfluoroalkoxy, amino, alkylamino, dialkylamino, alkylsulfonamido, alkylcarboxamido, nitro, cyano or carboxyl; or, A is a substituted phenyl group containing one or two substituents selected from cyano, nitro, alkyl, perfluoroalkyl, alkoxy, perfluoroalkoxy, amino, alkylamino, dialkylamino, sulfamyl, alkylsulfonamido, arylcarboxamido, alkylsulfonyl, perfluoroalkylsulfonyl, arylsulfonyl, chloro, bromo, fluoro, iodo, 1imidazolyl or carboxyl; or a pharmaceutically acceptable salt thereof, are smooth muscle relaxants.
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