InChI=1S/C20H18O9/c21-9-3-1-8(2-4-9)13-5-10(22)15-14(29-13)6-11(23)16(18(15)26)20-19(27)17(25)12(24)7-28-20/h1-6,12,17,19-21,23-27H,7H2/t12-,17+,19-,20+/m1/s1