Novel Compounds of the formula: ##STR1## [wherein A is an .alpha.-amino acid residue; B is a group represented by the formula: ##STR2## (wherein R.sup.4 is hydrogen, lower alkyl, aralkyl or amino-lower alkyl), whereby the linkage between the symbols A and B designates a peptide bond and the group R.sup.4 is B may be linked with A; R.sup.1 is hydrogen, lower alkyl or aralkyl; R.sup.2 is hydrogen, lower alkyl, aralkyl or acyl; X is alkylene] and salts thereof posses, for example, inhibitory activity on angiotension converting enzyme, and are useful as an agent for diagnosis, prevention or treatment of hypertension as well as circulatory diseases such as cardiopathy and cerebral apoplexy.
式子为:##
STR1##的新化合物[其中A为
α-氨基酸残基;B为由式子##
STR2##表示的基团(其中R.sup.4为
氢、低烷基、芳基烷基或
氨基-低烷基),A和B之间的连接表示肽键,且基团R.sup.4可以与A连接;R.sup.1为
氢、低烷基或芳基烷基;R.sup.2为
氢、低烷基、芳基烷基或酰基;X为烷基)及其盐具有抑制
血管紧张素转化酶的活性,可用作高血压、心脏病和脑卒中的诊断、预防或治疗剂。