New peptide compounds process for preparing these and pharmaceutical compositions containing them

The invention relates to compounds of formula (I): (I) in which: A represents, with the carbon and nitrogen atoms to which it is linked, cyclic amide as defined in the description, B represents, with the nitrogen and carbon atoms to which it is linked, saturated polycyclic structure as defined in the description, R represents hydrogen, optionally substituted lower alkyl, optionally substituted (4-imidazolyl)methyl, (3-pyrazolyl)methyl or optionally substituted (2-pyridyl)methyl, their enantiomers, diastereoisomers and epimers as well as their addition salts with a pharmaceutically acceptable acid. Medicinal products.