InChI=1S/C16H18N4O4/c1-10-14(19-15(22)12-4-2-3-5-13(12)21)16(23)20(24-10)7-6-11-8-17-9-18-11/h2-5,8-10,14,21H,6-7H2,1H3,(H,17,18)(H,19,22)