InChI=1S/C19H20O14/c20-9(32-15(18(29)30)13(24)16(25)26)6-3-7-1-4-8(5-2-7)31-19-12(23)10(21)11(22)14(33-19)17(27)28/h1-6,10-15,19,21-24H,(H,25,26)(H,27,28)(H,29,30)/b6-3+