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