Z-GLU(OBUT)-ONP Z-GLU(OTBU)-ONP Z-GLUTAMIC ACID(OTBU)-ONP Z-L-GLUTAMIC ACID GAMMA-T-BUTYL ESTER-ALPHA-4-NITROPHENYL ESTER N-[(Benzyloxy)carbonyl]-L-glutamic acid 5-(1,1-dimethylethyl)1-(4-nitrophenyl) ester BENZYLOXYCARBONYL-L-GLUTAMIC ACID GAMMA-T-BUTYL ESTER ALPHA-P-NITROPHENYL ESTER BENZYLOXYCARBONYL-L-GLUTAMIC ACID GAMMA-T-BUTYL-ALPHA-4-NITROPHENYL DI-ESTER Z-L-Glutamic acid beta-t-butyl ester alpha-4-nitrophenyl ester