InChI=1S/C20H20O6/c1-10-7-13(12-6-5-11(21)9-17(12)24)18(20(25)26)14(8-10)19-15(22)3-2-4-16(19)23/h2-6,8-9,13-14,18,21-24H,7H2,1H3,(H,25,26)