3',6'-dihydroxy-4',5'-dinitro-3h-spiro[2-benzofuran-1,9'-xanthen]-3-one, EINECS 246-308-0, 4',5'-dinitrofluorescein, 3',6'-Dihydroxy-4',5'-dinitro-spiro[phthalan-1,9'-xanthen]-3-on, 3',6'-dihydroxy-4',5'-dinitro-spiro[phthalan-1,9'-xanthen]-3-one, dinitrofluorescein, 3',6'-dihydroxy-4',5'-dinitrospiro(isobenzofuran-1(3H),9'-[9H]xanthene)-3-one, 4,5-dinitro-fluorescin free acid, Solvent orange 16