InChI=1S/C19H22N4O2/c1-14(2)8-9-22-18(24)16(12-15-6-4-3-5-7-15)23-19(25)17-13-20-10-11-21-17/h3-11,13-14,16H,12H2,1-2H3,(H,22,24)(H,23,25)/b9-8+/t16-/m0/s1