InChI=1/C15H16N2O4/c1-9-4-3-5-10(2)15(9)21-8-12-16-11(7-14(19)20)6-13(18)17-12/h3-6H,7-8H2,1-2H3,(H,19,20)(H,16,17,18)/p-1/fC15H15N2O4/h16H/q-1 5678C748DDA3A7AC