InChI=1S/C15H18N4O4/c16-12(5-9-1-3-11(20)4-2-9)14(21)19-13(15(22)23)6-10-7-17-8-18-10/h1-4,7-8,12-13,20H,5-6,16H2,(H,17,18)(H,19,21)(H,22,23)