InChI=1S/C21H20O12/c1-30-8-2-7-3-12(32-21-17(27)15(25)16(26)19(33-21)20(28)29)14-11(24)5-9(6-22)31-18(14)13(7)10(23)4-8/h2-5,15-17,19,21-23,25-27H,6H2,1H3,(H,28,29)