| 摘要 |
Compounds having the formula <IMAGE> wherein R1 is hydrogen, alkyl, aryl, arylalkyl or a hydrolyzable acyl protecting group; R2 is hydrogen, alkyl or trifluoromethyl; R3 and R4 each is independently hydrogen, halogen, trifluoromethyl, alkylamino, furylmethylamino, phenylamino, thienylmethylamino, alkoxy, aryloxy, benzylthio, arylthio, benzyl, benzoyl, hydroxy, cyano or arylmethoxy; R5 is hydrogen, alkyl or arylalkyl; and n is 0, 1 or 2, have hypotensive activity.
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