benzyl (R)-5-amino-4-((tert-butoxycarbonyl)amino)-5-oxopentanoate
tert-butoxycarbonyl-L-alanyl-D-isoglutamine benzyl ester
D-glutamic acid-5-benzyl ester
benzyl 4,6-O-benzylidene-2-benzyloxyacetamido-3-O-<1-(R)-carboxyethyl>-2-deoxy-α-D-glucopyranoside
2-benzyloxyacetic anhydride