774557-89-0

4-[4-[2-(4-nitrophenyl)-2-oxoethoxy]carbonylanilino]-4-oxobutanoic acid 4-keto-4-[[4-[2-keto-2-(4-nitrophenyl)ethoxy]carbonylphenyl]amino]butyric acid 4-[(4-{[2-(4-Nitrophenyl)-2-oxoethoxy]carbonyl}-phenyl)amino]-4-oxobutanoic acid 4-[[4-[[2-(4-nitrophenyl)-2-oxoethoxy]-oxomethyl]phenyl]amino]-4-oxobutanoic acid Benzoic acid, 4-[(3-carboxy-1-oxopropyl)amino]-, 1-[2-(4-nitrophenyl)-2-oxoethyl] ester