Abstract N-CBO-L-Seryl-L-tyrosyl-L-serine methyl ester and L-methionyl-γ-benzyl-L- glutamate are prepared by different methods. Condensation by the hydrazideazide procedure affords N-CBO-L-seryl-L-tyrosyl-L-seryl-L-methionyl-γ-benzyl-L-glutamate, which
