109727-22-2 3-Dibenzothiophenesulfonic acid, 7-p-sulfophenyl-, 5,5-dioxide, disodium salt 4,4'-Disulfo-p-terphenyl sulfone 4,4'-Disulfo-p-terphenyl sulfone disodium salt 7-p-Sulfophenyl-3-dibenzothiophenesulfonic acid 5,5-dioxide, disodium salt Iem 967 Iem-967