InChI=1S/C16H20N4O2/c1-3-14-19-11(2)13(16(22)20-14)10-15(21)18-9-6-12-4-7-17-8-5-12/h4-5,7-8H,3,6,9-10H2,1-2H3,(H,18,21)(H,19,20,22)