65072-27-7 EINECS 265-365-2 Tetrasodium 4-((1-hydroxy-6-((((5-hydroxy-6-((2-methyl-4-sulphonatophenyl)azo)-7-sulphonato-2-naphthyl)amino)carbonyl)amino)-3-sulphonato-2-naphthyl)azo)benzoate