InChI=1S/C20H24O8/c1-27-16-5-3-11(7-14(16)23)18(19(20(25)26)13(9-21)10-22)12-4-6-17(28-2)15(24)8-12/h3-8,13,18-19,21-24H,9-10H2,1-2H3,(H,25,26)/t19-/m1/s1