2-Naphthalenesulfonamide,5-[[(dimethylamino)sulfonyl]amino]-N-(1,1-dimethylethyl)-4-[[2-[[2-[4-[[[4-(1,3-dioxobutyl)phenyl]amino]sulfonyl]phenyl]ethyl]sulfonyl]-4-nitrophenyl]azo]-1-hydroxy-
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