| 摘要 |
Compounds of the formula <IMAGE> I and the pharmaceutically acceptable salts thereof, wherein R1, R2, R3 and R4 are independently selected from hydrogen or lower alkyl; n is 1 or 0; A and B taken together with the carbons to which they are attached form an alkylene ring having six carbon atoms or A and B are hydrogen; and Z is <IMAGE> <IMAGE> +TR <IMAGE> The compounds are useful as hypertensive agents.
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