| abstract |
Compounds of the formula ##STR1## in which R 1 represents acyl substituted by a thio, sulphinyl or sulphonyl group, A represents an optionally N-alkylated α-amino acid residue that is bonded N-terminally to R 1 and C-terminally to the group --NR 2 --, R 2 represents hydrogen or lower alkyl, R 3 represents hydrogen, lower alkyl, optionally etherified or esterified hydroxy-lower alkyl, cycloalkyl, cycloalkyl-lower alkyl, bicycloalkyl-lower alkyl, tricycloalkyl-lower alkyl, aryl or aryl-lower alkyl, R 4 represents hydroxy or etherified or esterified hydroxy, R 5 represents lower alkyl, optionally etherified or esterified hydroxy-lower alkyl, cycloalkyl, cycloalkyl-lower alkyl, bicycloalkyl, bicycloalkyl-lower alkyl, tricycloalkyl, tricycloalkyl-lower alkyl, aryl, aryl-lower alkyl, optionally substituted carbamoyl, optionally substituted amino, optionally substituted hydroxy, optionally substituted mercapto, sulphinyl or sulphonyl, and R 6 represents substituted amino, and salts of such compounds having salt-forming groups, inhibit the blood pressure-increasing action of the enzyme renin and can be used as anti-hypertensives. |