InChI=1S/C20H24O6/c1-14(4-8-18(25-13-21)20(2,3)23)10-11-24-16-7-5-15-6-9-19(22)26-17(15)12-16/h5-7,9-10,12-13,18,23H,4,8,11H2,1-3H3/b14-10+