| 摘要 |
Compounds of the formula <IMAGE> wherein each of R, R1 and R2 is independently H, alkyl, alkenyl, alkoxy, halo, hydroxy, trifluoromethyl, amino, alkylamino, cyano and nitro; R3 is carbalkoxy, carboxamide alkanoyl, trifluoromethyl and cyano; and Ar is heteroaryl or <IMAGE> wherein R4 and R5 have the same meaning as each of R, R1 and R2; and acid addition salts thereof have cardiotonic and hypertensive activity.
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