InChI=1S/C20H20O7/c1-9-5-11(10-7-16(24)17(25)8-15(10)23)18(20(26)27)12(6-9)19-13(21)3-2-4-14(19)22/h2-4,6-8,11-12,18,21-25H,5H2,1H3,(H,26,27)