The Crystal Structure of DL‐Histidine

  title={The Crystal Structure of DL‐Histidine},
  author={P T Edington and Marjorie M. Harding},
The structure of dl-histidine, C6H9N3O2, has been determined from three-dimensional X-ray diffraction data and refined until R = 0.13 and standard deviations in bond lengths are ∼ 0.005 A. The crystals are monoclinic, P21/c, with a = 8.983, b = 8.087, c = 9.415 A, β = 97.65°. The histidine molecule is nearly fully extended but the conformation is not the same as that of the chemically identical histidine molecules in crystalline L-histidine.