Novel peptides of the formula <IMAGE> are disclosed (together with pharmaceutical compositions comprising a pharmaceutically effective amount of same) wherein X1 and X2 represent an hydroxy or amino group and B represents: (1) hydroxy or (2) an amino-acid residue selected from the group consisting of L-Asp-OH, L-Asn-OH, L-Glu-OH, L-Gln-OH, L-Ser-OH, or HN-A-COOH, wherein A is an alkylidene group from 1 to 6 carbon atoms; or a functional derivative thereof.
Psychopharmacological peptides suitable for therapeutic administration