Sigma-Aldrich
Copper
CARBOBENZYLOXY-L-PHENYLALANYL-L-VALINE BENZYL ESTER
CARBOBENZYLOXY-L-THREONYL-L-PHENYLALANINAMIDE
CARBOBENZYLOXY-L-TRYPTOPHYLGLYCYLGLYCINE METHYL ESTER
CARBOBENZYLOXY-L-TYROSYL-L-TRYPTOPHANAMIDE