InChI=1/C14H13N3O4/c1-8-3-4-10-9(7-8)15-12(18)14(2,21-10)13(19)16-11-5-6-20-17-11/h3-7H,1-2H3,(H,15,18)(H,16,17,19)/t14-/m1/s1/f/h15-16H 994BA38AFFECF68C