N-(tert-butyloxycarbonyl)-L-tyrosyl-D-alanylglycyl-L-phenylalanyl-L-methionine methyl ester

Boc Tyr D.Ala Gly Phe OH

Methyl tert-butyloxycarbonyltyrosyl-(D)alanylglycylphenylalaninate

Boc-(L)(α-Me)Tyr-OH