Synonyms: Benzenesulfonicacid,[[6'-[(2,4-dimethylphenyl)amino]-1,1-dioxidospiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthen]-3'-yl]amino]dimethyl-,monosodium salt (9CI); Benzenesulfonic acid,[[6'-[(2,4-dimethylphenyl)amino]spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthen]-3'-yl]amino]dimethyl-,S,S-dioxide, monosodium salt; Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene],benzenesulfonic acid deriv.