InChI=1/C16H20N4/c1-3-16(4-2,11-18)20-15-13(10-17)9-12-7-5-6-8-14(12)19-15/h5-9H,3-4,11,18H2,1-2H3,(H,19,20)/p+1/fC16H21N4/h18,20H/q+1 4C4D476F80AB28C4