InChI=1S/C27H18O9/c1-35-18-11-16(29)20(22(31)12-6-3-2-4-7-12)25(34)19(18)14-10-17(30)27-21(24(14)33)23(32)13-8-5-9-15(28)26(13)36-27/h2-11,28-30,33-34H,1H3