InChI=1S/C26H22O8/c1-12-7-6-8-17-20(12)24(28)26(3,33-17)34-22-18(31-5)9-13(2)19-15-10-14(30-4)11-16(27)21(15)25(29)32-23(19)22/h6-11,27H,1-5H3/t26-/m0/s1