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