InChI=1S/C20H18O11/c21-8-3-9(22)16-10(23)5-13(30-14(16)4-8)7-1-11(24)17(26)15(2-7)31-20-19(28)18(27)12(25)6-29-20/h1-5,12,18-22,24-28H,6H2/t12-,18+,19-,20+/m1/s1