InChI=1S/C21H22O12/c22-9-4-1-8(2-5-9)3-6-10(23)13-11(24)7-12(14(25)15(13)26)32-21-18(29)16(27)17(28)19(33-21)20(30)31/h1-7,10,16-19,21-29H,(H,30,31)/b6-3+