InChI=1S/C26H30O5/c1-17(2)23(28)14-6-18(3)5-12-22-25(31-4)16-13-21(26(22)30)24(29)15-9-19-7-10-20(27)11-8-19/h5,7-11,13,15-16,23,27-28,30H,1,6,12,14H2,2-4H3/b15-9+,18-5+