2-[[4-[[2,4-Diamino-5-[(2-hydroxy-5-sulfophenyl)azo]phenyl]azo]phenyl]amino]-5-nitrobenzenesulfonic acid

2-[[4-[[2,4-diamino-5-[(2-hydroxy-5-sulphophenyl)azo]phenyl]azo]phenyl]amino]-5-nitrobenzenesulphonic acid