| abstract |
1. A COMPOUND OF THE FORMULA R4-L-TRP-L-SER(R2)-L-PHE-GLY(R) IN WHICH R IS HYDROGEN, METHYL, ETHYL, P-NITROBENZYL, OR BENZYL; R2 IS T-BUTYL OR BANZYL; AND, WHEN R2 IS T-BUTYL, R4 IS H-, CBZ-, OR (ADOC)2-L-HIS-; AND, WHEN R2 IS BENZYL, R4 IS H-, CHZ-, BOC-, AOC-, ADOC-, OR (ADOC)2-L-HIS-. |