Synonyms: Benzenesulfonicacid, 2-[bis(3,5-dichloro-2-hydroxyphenyl)methyl]-, monosodium salt (9CI);o-Toluenesulfonic acid, a,a-bis(3,5-dichloro-2-hydroxyphenyl)-,monosodium salt (8CI);2,2'-Dihydroxy-3,5,3',5'-tetrachlorotriphenylmethane-2''-sodium sulfonate;Eulan New; Sodium 2,2'-dihydroxy-3,3',5,5'-tetrachlorotriphenylmethane-2''-sulfonate