InChI=1S/C21H20O11/c1-6-4-7-8(15(25)13-10(23)3-2-9(22)12(13)14(7)24)5-11(6)31-21-18(28)16(26)17(27)19(32-21)20(29)30/h2-5,15-19,21-23,25-28H,1H3,(H,29,30)