The molecular structure of the title compound, C12H19N3O4, shows that the t
hree moieties attached to the central, neutral N atom are each nearly plana
r. The molecules are linked by O-H ... O hydrogen bonds between the COOH gr
oup and one of the pyrrolidone groups of an adjacent molecule, and C-H ...
O hydrogen bonds between one methylene of another pyrrolidone group and the
C=O of the same pyrrolidone group of an adjacent molecule.