Compounds of the formula ##STR1## wherein X is an imino acid or ester and R.sub.1 is hydrogen, ##STR2## are useful hypotensive agents due to their angiotensin converting enzyme inhibition activity.
式##STR1##中的化合物,其中X是一种亚氮酸或酯,R.sub.1是氢,##STR2##是由于它们的抑制
血管紧张素转化酶活性而有用的降压剂。