InChI=1S/C16H20N4O4/c17-11(16(23)24)5-6-14(21)20-15(22)12(18)7-9-8-19-13-4-2-1-3-10(9)13/h1-4,8,11-12,19H,5-7,17-18H2,(H,23,24)(H,20,21,22)