InChI=1S/C21H22O12/c1-7(8-2-3-10(23)11(24)4-8)15(26)14-12(25)5-9(22)6-13(14)32-21-18(29)16(27)17(28)19(33-21)20(30)31/h2-7,16-19,21-25,27-29H,1H3,(H,30,31)