Anti-hypertensive compounds of the formula ##STR1## in which A represents hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.7 -C.sub.14 -aralkyl, phenylsulphonyl, tolylsulphonyl or C.sub.1 -C.sub.8 -alkylsulfphonyl, or represents an aminoprotective group,B represents a direct bond, or represents sarcosyl, or represents a group of the formula ##STR2## D represents a direct bond, or represents a group of the formula ##STR3## wherein X represents methylene, ethylene or sulphur,E, G, J, K, L and M independently have the same meanings as B,R.sup.1 is an optionally substituted phenyl radical, andQ is a hydroxy, alkoxy or amino group, or a physiologically acceptable salt thereof.