InChI=1S/C20H24O6/c1-13-7-6-10-16(22)9-5-3-4-8-15-11-17(26-14(2)21)12-18(23)19(15)20(24)25-13/h4,8,11-13,23H,3,5-7,9-10H2,1-2H3/b8-4+