3',6'-Dihydroxy-4',5'-dijod-spiro[phthalan-1,9'-xanthen]-3-on, 3',6'-dihydroxy-4',5'-diiodospiro(isobenzofuran-1(3H),9'-[9H]xanthene)-3-one, 4',5'-di-iodo-fluorescein, D & C ORANGE NO. 11, DC Orange No. 10, 4,5-diiodofluorescein, Spiro[isobenzofuran-1(3H),9‘-[9H]xanthen]-3-one, 3‘,6‘-dihydroxy-4‘,5‘-diiodo-, 4,5-diiodofluoroescein, 3',6'-dihydroxy-4',5'-diiodo-spiro[phthalan-1,9'-xanthen]-3-one, 4',5'-Diiodofluorescein (C.I. 45425:1)