Pentapeptides of formula I, ##STR1## wherein Z.sup.1 =H, CH.sub.3 or amidino; R.sub.1 =H or alkyl and R.sub.2 =H or R.sub.1 +R.sub.2 =--CH.sub.2 --CH.sub.2 --; R.sub.3 =m- or p--OH or -alkoxy; B=residue of a (D)-.alpha.-amino acid; R.sub.4 =H or alkyl; Z.sup.2 =optionally substituted phenyl; and E=.beta.-amino alcohol residue (whereby when Z.sup.1 =H or CH.sub.3, R.sub.4 =C.sub.3-4 -alkyl) as well as their esters and the acid addition salts and complexes of such peptides and esters. Compounds according to the invention have valuable pharmacological, in particular LH-secretion inhibiting activity.
公式I的五肽,##STR1##其中Z.sup.1 = H,CH.sub.3或amidino; R.sub.1 = H或烷基,R.sub.2 = H或R.sub.1 + R.sub.2 = --CH.sub.2 --CH.sub.2 --; R.sub.3 = m-或p--OH或-alkoxy; B=(D)-
α-氨基酸残基; R.sub.4 = H或烷基; Z.sup.2 = 可选取代的苯基; E = .beta.-
氨基醇残基(当Z.sup.1 = H或CH.sub.3时,R.sub.4 = C.sub.3-4-烷基)。该发明化合物及其酯和酸加成盐和复合物具有有价值的药理学作用,特别是LH分泌抑制活性。