InChI=1S/C20H28O2/c1-19-10-8-14(22-3)12-13(19)4-5-15-16-6-7-18(21)20(16,2)11-9-17(15)19/h4,12,15-17H,5-11H2,1-3H3/t15-,16-,17-,19-,20-/m0/s1