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