2,5-Dioxopyrrolidin-1-yl 2-methylprop-2-enoate

In the title compound, C8H9NO4, the pyrrolidine ring (r.m.s. deviation 0.014 Å) is almost normal to the mean plane of the propenoate group (r.m.s deviation 0.028 Å), making a dihedral angle of 86.58 (4)°. In the crystal, molecules are linked via pairs of weak C—H...O hydrogen bonds, forming inversion dimers which stack along the c axis.