InChI=1S/C26H26O6/c1-13(2)6-8-16-18(27)12-21-22(24(16)28)25(29)23-20(10-14(3)4)31-19-11-15(30-5)7-9-17(19)26(23)32-21/h6-13,20,27-28H,1-5H3/b8-6+