N-(DL-3-mercapto-2-methyl-1-oxopropyl)-L-tyrosine
5-dimethylamino-1-naphthalene-sulphonyl-L-tyrosine
L-tyrosine
N-(S-benzoyl-3-mercapto-2-methylpropanoyl)-O-benzyloxycarbonyl-L-tyrosine
N-(S-benzoyl-2-mercaptopropanoyl)-O-benzyloxycarbonyl-L-tyrosine