3',6'-bis(ethylamino)-2',7'-dimethylspiro(isobenzofuran-1(3H),9'-[9H]xanthene)-3-one, 3',6'-Bis-aethylamino-2',7'-dimethyl-spiro[phthalan-1,9'-xanthen]-3-on, 3',6'-bis-ethylamino-2',7'-dimethyl-spiro[phthalan-1,9'-xanthen]-3-one, 3',6'-BIS(ETHYLAMINO)-2',7'-DIMETHYL-3H-SPIRO[2-BENZOFURAN-1,9'-XANTHEN]-3-ONE, rhodamine-6G,