InChI=1S/C21H27NO2/c23-20(16-8-3-1-4-9-16)14-18-12-7-13-19(22-18)15-21(24)17-10-5-2-6-11-17/h1-6,8-11,18-24H,7,12-15H2/t18-,19+,20+,21-