Farmitalia Carlo Erba S.p.a.

Fiorenzo Faoro

Francesco Santangelo

Roberto De Castiglione

Giuseppe Perseo

Silvano Piani

There is disclosed biologically active peptides of the formula ##STR1## where X is a hydrogen atom, an N-terminus protecting group (any of an acyl-type protecting group, an aromatic urethane-type protecting group, an alkyl-type protecting group, or an alkyl urethane type protecting group), or a residue of a natural L-amino acid or a dipeptide formed of two natural L-amino acids, wherein the free amino group may be replaced by any of the foregoing N-terminus protecting groups;

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Milan, Italy

Fiorenzo Faoro