N-(tert-butyloxycarbonyl)-L-tyrosyl-O-tert-butyl-D-serylglycyl-L-phenylalanyl-L-leucine methyl ester

N-(tert-butyloxycarbonyl)-L-tyrosyl-O-tert-butyl-D-serylglycyl-L-phenylalanyl-L-leucyl-O-tert-butyl-L-threonine methyl ester