70304-37-9 Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((2-methoxy-5-methyl-4-((4-sulfophenyl)azo)phenyl)azoxy)-, tetrasodium salt EINECS 274-549-1 Tetrasodium 4,4'-bis((2-methoxy-5-methyl-4-((4-sulphonatophenyl)azo)phenyl)azoxy)stilbene-2,2'-disulphonate