1,7(3H,4H)-isobenzofurandione, tetrahydro-4-hydroxy- 4-hydroxytetrahydro-2-benzofuran-1,7(3H,4H)-dione InChI=1/C8H10O4/c9-5-1-2-6(10)7-4(5)3-12-8(7)11/h4-5,7,9H,1-3H