title: Pyrrolidine-2,5-dione.
abstract: In the title compound, C(4)H(5)NO(2), the non-H atoms are nearly coplanar, with a maximum deviation of 0.030 (1) Å. In the crystal, pairs of mol-ecules are linked by N-H⋯O hydrogen bonds into inversion dimers.
authors.affiliation: Agronomy College, Sichuan Agricultural University, No. 211, Huiming Road, Wenjiang Region, Chengdu 611130,  People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Yu
authors.forename: Xing
authors.initials: X
authors.lastname: Huang
authors.forename: Feng
authors.initials: F
authors.lastname: Gao