InChI=1S/C27H28O6/c1-26(2)10-9-16-13-17(6-8-20(16)33-26)23-24(28)21(32-25(23)29)12-15-5-7-19-18(11-15)14-22(31-19)27(3,4)30/h5-8,11-13,22,28,30H,9-10,14H2,1-4H3/b21-12+/t22-/m1/s1