1,10-Phenanthroline, 4,7-di(phenylsulfonic acid)-, disodium salt 4,7-Di(4-phenylsulfonic acid)-1,10-phenanthroline, disodium salt 53744-42-6 Benzenesulfonic acid, 4,4'-(1,10-phenanthroline-4,7-diyl)bis-, disodium salt Disodium 4,4'-(1,10-phenanthroline-4,7-diyl)bis(benzenesulphonate) EINECS 258-740-7