InChI=1S/C20H27NO3/c22-20(21-13-7-8-14-21)10-6-4-2-1-3-5-9-17-11-12-18-19(15-17)24-16-23-18/h5,9,11-12,15H,1-4,6-8,10,13-14,16H2/b9-5+