(S)-5-((4-Amino-4-carboxy-1-oxobutyl)amino)-2-nitrobenzoic acid 53602-84-9 Benzoic acid, 5-((4-amino-4-carboxy-1-oxobutyl)amino)-2-nitro-, (S)- EINECS 258-657-6 gamma-Glutamyl-3-carboxy-4-nitroanilide