InChI=1/C16H16N4O/c1-10(2)20-15-8-11(4-6-13(15)18-16(20)21)14-7-5-12(9-17)19(14)3/h4-8,10H,1-3H3,(H,18,21)/f/h21H 3942CAB8A8FFABD7