InChI=1S/C20H27NO3/c1-16(2)14-21-20(22)10-8-6-4-3-5-7-9-17-11-12-18-19(13-17)24-15-23-18/h7,9,11-13H,1,3-6,8,10,14-15H2,2H3,(H,21,22)/b9-7+