Sigma-Aldrich
Copper
CARBOBENZYLOXY-L-NORVALYL-L-ISOLEUCINE
CARBOBENZYLOXY-L-PHENYLALANYL-L-VALINE METHYL ESTER
CARBOBENZYLOXY-L-THREONYL-L-PHENYLALANINE METHYL ESTER
CARBOBENZYLOXY-L-TYROSINE 4-NITROPHENYL ESTER
CARBOBENZYLOXY-L-TYROSYL-L-TYROSINE