InChI=1S/C21H20O12/c1-30-14-6-12-7(2-10(14)22)3-13(32-12)9-4-8(5-11(23)15(9)24)31-21-18(27)16(25)17(26)19(33-21)20(28)29/h2-6,16-19,21-27H,1H3,(H,28,29)