InChI=1S/C22H20O6/c1-22(2)18(28-22)11-14-9-12(3-8-17(14)24)10-16-19(21(26)27-20(16)25)13-4-6-15(23)7-5-13/h3-9,18,23-24H,10-11H2,1-2H3