1,10-Phenanthroline, 2,9-dimethyl-4,7-di(phenylsulfonic acid)-, disodium salt 2,9-Dimethyl-4,7-di(4-sulfophenyl)-1,10-phenanthroline, disodium salt 40386-51-4 62750-33-8 Benzenesulfonic acid, 4,4'-(2,9-dimethyl-1,10-phenanthroline-4,7-diyl)bis-, disodium salt Disodium 4,4'-(2,9-dimethyl-1,10-phenanthroline-4,7-diyl)bis(benzenesulphonate) EINECS 254-899-1