3,6-Dihydroxy-4,5-diiodo-2,7-dimethylspiro[9H-xanthene-9,1'(3'H)-isobenzofuran]-3'-one

3',6'-dihydroxy-4',5'-diiodo-2',7'-dimethylspiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one