InChI=1S/C26H28O6/c1-15(2)6-5-7-16(3)8-10-18-20(28)13-24-25(26(18)30)21(29)14-22(32-24)17-9-11-19(27)23(12-17)31-4/h6,8-9,11-14,27-28,30H,5,7,10H2,1-4H3/b16-8+