InChI=1S/C20H18O11/c21-9-2-1-7(3-10(9)22)19-17(27)16(26)14-11(23)4-8(5-13(14)31-19)30-20-18(28)15(25)12(24)6-29-20/h1-5,12,15,18,20-25,27-28H,6H2