Cyclopeptides.

This invention relates to the general formula I of the new cyclic peptides and their salts ring-(A-B-C-D-Arg) (I) a and b as Ala,Asn,Asp,Arg,Cys,Gln,Glu,Gly,His,Ile,Leu,Lys,Met,Phe,Pro,Ser,Thr,Trp,Tyr or Val, c for the Asp or Asp (O-C1-4 alkyl), d-Ala or Gly, at least two of these amino acid residues occur in a D-configuration. consolidation of those compounds as inhibitors of protein can be used for prevention and treatment of diseases of the circulatory system and cancer therapy.