InChI=1/C20H21NO2/c1-12-11-20(2,3)21-15-10-9-14-13-7-5-6-8-16(13)23-19(22-4)18(14)17(12)15/h5-11,19,21H,1-4H3/t19-/m1/s1 A35249054349ABC6