145594-19-0 L-Phenylalanine, N-(N-(N-(N,O-bis(1,1-dimethylethoxy)carbonyl)-L-tyrosyl)-D-alanylglycyl)- N-(N-(N-(N,O-Bis(1,1-dimethylethoxy)carbonyl)-L-tyrosyl)-D-alanylglycyl)-L-phenylalanine N-tert-Butoxycarbonyltyrosyl-(O-tert-butoxycarbonyl)-D-alanylglycylphenylalanine