The Crystal Structures of the α and β Forms of DL-Methionine

The crystal structures of the α and β forms of DL-methionine have been refined by block-diagonal least-squares calculations using three-dimensional X-ray data to R=0.118 and 0.088 respectively. The structures of both the forms are essentially the same as those previously reported by Mathieson (Acta Crystallogr., 5, 332 (1952)).