Vega Laboratories, Inc.

Alan J Fischman

Joseph H Cort

Novel analogs of biologically active vasopressin and its synthetic analogs having improved activity are represented by the structural formula: ##STR1## wherein A hydrogen; is hydroxy or lower alkoxy, especially methoxy, B is the peptide residue of phenylalanine (Phe) or isoleucine, Gln represents the peptide residue of glutamine Asn represents the peptide residue of asparagine, E represents the peptide residue of proline (Pro), 4-thioproline (4-thioPro) or 3,4-dehydroproline (3,4-dehydroPro), FNH represents an N-substituted peptide residue of L- or D-lysine (Lys) L or D homolysine (h Lys) or L- or D-orntihine (Orn), X represents a side peptide chain consisting of one or more of Gly, L-Ala, L-Val, L-Leu, or L-Phe, Gly represents the peptide residue of glycine, and G is disulfide (--S--S--) or thioether (--CH.sub.2 S-- or --SCH.sub.2 --).

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Brooklyn, NY, United States of America

Alan J Fischman