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