InChI=1S/C11H16N4O4/c12-8(1-6-3-13-5-14-6)10(17)15-4-7(16)2-9(15)11(18)19/h3,5,7-9,16H,1-2,4,12H2,(H,13,14)(H,18,19)/t7-,8+,9+/m1/s1