100111-02-2 3',6'-Dihydroxy-4',5'-dimethyl-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-5-carboxylic acid 4',5'-Dimethyl-5-carboxyfluorescein Me2CF Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-5-carboxylic acid, 3',6'-dihydroxy-4',5'-dimethyl-3-oxo-