InChI=1S/C25H26O6/c1-14(2)5-4-6-15(3)7-9-18-20(28)12-23-24(25(18)30)21(29)13-22(31-23)17-10-8-16(26)11-19(17)27/h5,7-8,10-13,26-28,30H,4,6,9H2,1-3H3/b15-7+