InChI=1S/C22H20O7/c1-22-6-4-5-13(28-22)18-15(29-22)9-12-17(21(18)25)20(24)16-11(19(12)23)7-10(26-2)8-14(16)27-3/h7-9,13,25H,4-6H2,1-3H3