InChI=1S/C18H20N4O2/c1-21(2)12-6-11-19-18-13-7-3-4-8-14(13)20-15-9-5-10-16(17(15)18)22(23)24/h3-5,7-10H,6,11-12H2,1-2H3,(H,19,20)