InChI=1/C14H13N3O4/c18-11-7-8-3-1-2-4-9(8)13(11)16-14(19)10-5-6-12(15-10)17(20)21/h1-6,11,13,15,18H,7H2,(H,16,19)/t11-,13-/m0/s1/f/h16H DFDDF5C03BD0E1C6