(S)-2-Amino-5-((4-nitrophenyl)amino)-5-oxopentanoic acid 110893-27-1 7300-59-6 EINECS 230-748-5 L-2-Amino-4'-nitroglutaranilic acid L-Glutamine, N-(4-nitrophenyl)- L-gamma-Glutamyl-p-nitroanilide N-(4-Nitrophenyl)-L-glutamine gamma-Glutamine-4-nitroanilide