InChI=1S/C28H38O4/c1-20(2)10-7-14-24(28(31)32-6)15-9-13-21(3)11-8-12-22(4)16-17-25-19-26(29)23(5)18-27(25)30/h10-11,15-16,18-19H,7-9,12-14,17H2,1-6H3/b21-11+,22-16+,24-15-