Benzenesulfonic acid, 4-2,4-dihydroxy-5-4-(4-sulfophenyl)azophenylazophenylazo-, disodium salt

disodium 4-[[2,4-dihydroxy-5-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]phenyl]azo]benzenesulphonate

4-[2,4-Dihydroxy-5-[4-[4-(sodiosulfo)phenylazo]phenylazo]phenylazo]benzenesulfonic acid sodium salt