InChI=1S/C16H20N2O/c1-10(9-19)6-13-12-4-3-5-14-16(12)11(8-18-14)7-15(13)17-2/h3-5,8-10,13,15,17-18H,6-7H2,1-2H3/p+1/t10?,13-,15-/m1/s1