InChI=1S/C18H20N2O/c1-19-8-9-20-17-11-15(21)7-6-14(17)10-13-4-2-3-5-16(13)18(20)12-19/h2-7,11,18,21H,8-10,12H2,1H3/t18-/m0/s1