InChI=1S/C21H25NO2/c1-22-18-12-13-19(22)15-21(23,14-18)24-20(16-8-4-2-5-9-16)17-10-6-3-7-11-17/h2-11,18-20,23H,12-15H2,1H3/t18-,19+,21+