Abstract: | In the title compound, C4H5NO3, the morpholine ring adopts a boat conformation that is distorted towards twist–boat, the boat ends being the two Csp3 atoms of the ring. The molecular packing is stabilized by the establishment of strong intermolecular NH⋯OC hydrogen bonds, which give rise to centrosymmetric dimers, and a network of weak CH2⋯OC hydrogen bonds, where each dimer interacts with eight neighbouring morpholinedione rings. |