InChI=1/C13H16N4O4/c1-13(2,3)15-11(18)12(19)16-14-8-9-4-6-10(7-5-9)17(20)21/h4-8H,1-3H3,(H,15,18)(H,16,19)/b14-8+/f/h15-16H 84C2753BDF505071