InChI=1S/C24H28O3/c1-23(2)13-19(14-24(3,4)15-23)21(17-9-11-20(25)12-10-17)16-5-7-18(8-6-16)22(26)27/h5-12,25H,13-15H2,1-4H3,(H,26,27)