InChI=1S/C21H20O12/c1-30-13-6-11-7(2-12(31-11)9-4-8(22)5-10(23)15(9)24)3-14(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)