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