4-[3-Methoxy-4-[3-[2-methoxy-4-(4-sulfophenylazo)-5-methylphenyl]ureido]phenylazo]benzenesulfonic acid

4-[[3-Methoxy-4-[[[[2-methoxy-5-methyl-4-[(4-sulfophenyl)azo]phenyl]amino]carbonyl]amino]phenyl]azo]benzenesulfonic acid