Sigma-Aldrich
Copper
CARBOBENZYLOXY-L-NORVALYL-L-SERINE
CARBOBENZYLOXY-L-SERYL-L-ALANINE METHYL ESTER
CARBOBENZYLOXY-L-TRYPTOPHYL-L-PHENYLALANINAMIDE
CARBOBENZYLOXY-L-TYROSYL-L-LEUCINE METHYL ESTER