InChI=1/C15H14N4O4/c20-14-5-6-16-8-12(14)18-15(21)9-1-4-11(17-10-2-3-10)13(7-9)19(22)23/h1,4-8,10,17H,2-3H2,(H,16,20)(H,18,21)/f/h16,18H 4D0F8F39F18CF170