(2S)-3-(4-hydroxyphenyl)-2-[methyl(phenylmethoxycarbonyl)amino]propanoic acid

N-Cbz-D-alanyl-L-alanyl-N,O-dimethyl-L-tyrosyl-L-alanine

methyl N-Cbz-N-methyl-L-tyrosyl-L-alaninate

methyl N-Cbz-N,O-dimethyl-L-tyrosyl-L-alaninate

methyl N-Cbz-L-alanyl-N,O-dimethyl-L-tyrosyl-L-alaninate