| 摘要 |
Title compds. (IB; A = -(CH2)2-; R = hydrogen atom, C1-4 satd. or unsatd. alkyl such as methyl, ethyl, propyl, butyl, isopropyl, isobutyl, tert-butyl, vinyl, propenyl, butenyl, ethinyl; m = 3, 4 or 5; dot line means secondary bond), which had hypotensive activity, were prepd. by the acid hydrolysis of compound IA in the presence of acetic acid, HCl, H2SO4 or trifluoroacetic acid.
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