PHYSIOLOGICALLY ACTIVE PEPTIDES AND A PROCESS FOR PREPARATION THEREOF

摘要

The present invention relates to new physiologically active peptides, derivatives thereof and a process for preparation thereof. In particular, it relates to new tetrapeptides designated amastatins A1, A2, A3, B1 and B2 and derivatives thereof which have an inhibitory effect on aminopeptidase A and also show stimulation of antibody formation and to a process for preparation thereof by cultivating a strain belonging to the genus Streptomyces.