1-(2-Hy­droxy­eth­yl)pyrrole-2,5-dione

The asymmetric unit of the title compound, C(6)H(7)NO(3), contains two mol­ecules (A and B) related by a non-crystallographic twofold pseudo-axis. The mol­ecules are joined in the (AABB)(n) manner by O—H⋯O hydrogen bonds between their hy­droxy groups, thus forming C(2) chains along the a-axis direction. Neighboring mol­ecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hy­droxy H atoms are disordered other two sets of sites with half occupancies (superimposed O—H⋯O and O⋯H—O fragments). The mol­ecules are further linked by C—H⋯O inter­actions, which can be considered to be weak hydrogen bonds.