for the following products
3',6'-Dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthene]-ar-carboxylic acid | 3′,6′-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9′-[9H]xanthene]-ar-carboxylic acid | 5(6)-Carboxyfluorescein | 5(6)-Fam and 5(6)-Carboxyfluorescein mixed isomers
