Biologically active peptides, processes for preparing them and pharmaceutical compositions.

摘要

Peptides the of formula: wherein R, X and Y are hydrogen or a protecting group, A is a D-amino acid, B is a valence bond or is glycine or sarcosine or a D or L-neutral amino acid or N-methyl amino acid, C is a valence bond, an amino acid; or a di- or tripeptide thereof and n is O or an integer from 1 to 12, or a pharmaceutically acceptable salt thereof. These peptides are useful in the treatment of addictive behavior and opiate- or alcohol-dependence. Processes for preparing the peptides are also disclosed.