The structure of hydroxyproline

Introduction and experimental In a recent short communication (Zussman, 1951) the general features of the hydroxyproline structure were described. The structure analysis was undertaken in order to establish the general configuration of the molecule, and this was achieved by examination of the aand b-axis projections. Further refinement of each projection has now been carried out, and Figs. 1 and 2 show electron-density maps thus obtained.