1983 Volume 31 Issue 7 Pages 2349-2352
A newly isolated bovine brain pentapeptide, Thr-Ser-Lys-Tyr-Arg (neo-kyotorphin), which contains the Tyr-Arg (kyotorphin) unit at its carboxyl terminal portion, was synthesized by using the TFMSA-TFA-thioanisole deprotecting procedure. The synthetic peptide exhibited dosedependent analgesic activity in mice at a level approximately equal to that of Leu-enkephalin.