| 摘要 |
Compounds having the formula <IMAGE> and basic salts thereof, wherein R1 is hydrogen, alkyl, aryl, arylalkyl or <IMAGE> wherein R6 is alkyl or aryl; R2 is hydrogen, alkyl, trifluoromethyl or pentafluoroethyl; R3 is hydrogen or alkyl; R4 is hydrogen, alkyl or arylalkyl; R5 is hydrogen or alkyl; and n is 0, 1 or 2; have hypotensive activity.
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