InChI=1S/C18H22N2O/c1-2-5-15(6-3-1)13-20-16-8-10-18(11-9-16)21-14-17-7-4-12-19-17/h1-3,5-6,8-11,17,19-20H,4,7,12-14H2/t17-/m1/s1