Z-GLY-GLY-SER-OH

N-CBZ-GLY-GLY-SER

Z-GLYCYL-GLYCYL-L-SERINE

REF DUPL: Z-Gly-Gly-Ser-OH

N-[N-[N-[(Phenylmethoxy)carbonyl]glycyl]glycyl]-L-serine

(S)-12-hydroxy-3,6,9-trioxo-1-phenyl-2-oxa-4,7,10-triazadodecane-11-carboxylic acid