InChI=1S/C20H27NO2/c1-2-3-4-5-6-7-8-9-10-13-17-16-20(22)18-14-11-12-15-19(18)21(17)23/h7-8,11-12,14-16,22H,2-6,9-10,13H2,1H3/b8-7-