InChI=1S/C11H14N4O4/c16-2-5-9(17)10(18)7(15-5)4-1-12-8-6(4)13-3-14-11(8)19/h1,3,5,7,9-10,12,15-18H,2H2,(H,13,14,19)/t5-,7+,9-,10+/m1/s1