InChI=1/C19H22N4/c1-13-8-9-14(2)17(12-13)18-15-6-3-4-7-16(15)19(23-22-18)21-11-5-10-20/h3-4,6-9,12H,5,10-11,20H2,1-2H3,(H,21,23)/p+2/fC19H24N4/h20-21,23H/q+2 1F4B581456DB475E