InChI=1S/C17H22N2O2/c1-19-9-11(10-20)7-17(21-2)13-4-3-5-14-16(13)12(8-18-14)6-15(17)19/h3-5,8,11,15,18,20H,6-7,9-10H2,1-2H3/t11-,15?,17?/m1/s1