(2S)-1-Carbamoylpyrrolidine-2-carboxylic acid

In the title compound, also known as N-carbamoyl-L-proline, C₆H₁₀N₂O₃, the pyrrolidine ring adopts a half-chair conformation, whereas the carboxyl group and the mean plane of the ureide group form an angle of 80.1 (2)°. Mol­ecules are joined by N-H...O and O-H...O hydrogen bonds into cyclic structures with graph-set R²₂(8), forming chains in the b-axis direction that are further connected via N-H...O hydrogen bonds into a three-dimensional network.