InChI=1S/C21H20O11/c22-7-16-17(27)18(28)19(29)21(32-16)30-9-4-12(24)10-6-14(26)20(31-15(10)5-9)8-1-2-11(23)13(25)3-8/h1-6,16-19,21-22,27-29H,7H2,(H3-,23,24,25,26)/p+1