InChI=1S/C11H16N4O4/c16-7-2-8(13-4-7)10(17)15-9(11(18)19)1-6-3-12-5-14-6/h3,5,7-9,13,16H,1-2,4H2,(H,12,14)(H,15,17)(H,18,19)