Synonyms: 3',6'-Bis(dimethylamino)-5-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one;Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-bis(dimethylamino)-5-isothiocyanato-;spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 3',6'-bis(dimethylamino)-5-isothiocyanato-