InChI=1S/C20H20O12/c1-20(29)5-9(23)12-10(32-20)3-6-2-7(21)4-8(22)11(6)16(12)30-19-15(26)13(24)14(25)17(31-19)18(27)28/h2-4,13-15,17,19,21-22,24-26,29H,5H2,1H3,(H,27,28)