InChI=1/C13H16N4O4/c18-12-8-16(6-5-14-12)9-13(19)15-7-10-3-1-2-4-11(10)17(20)21/h1-4H,5-9H2,(H,14,18)(H,15,19)/f/h14-15H 426AE03703B9F03D