InChI=1S/C12H16N4O4/c1-5-7-11(14-3-13-5)16(4-15-7)12-9(19)8(18)10(20-12)6(2)17/h3-4,6,8-10,12,17-19H,1-2H3/t6-,8+,9-,10-,12-/m1/s1