| 摘要 |
Regulators of the cardiovascular system and, in particular, in the treatment of hypertension having the formula <IMAGE> (I) pharmaceutically-acceptable bioprecursors thereof, and the pharmaceutically-acceptable acid addition salts thereof; wherein each of R1 and R2 is C1-4 alkyl or -CH2CF3; alk is ethylene, monophenyl substituted ethylene, mono- and dimethyl substituted ethylene or monophenylmonomethyl substituted ethylene; and R3 is hydrogen, C1-4 alkyl, C3-C6 cycloalkyl; phenyl or substituted phenyl; and methods for their preparation.
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