Crystal and molecular structure ofdl-lysine hydrochloride

The crystal structure ofdl-lysine hydrochloride has been determined by the heavy-atom technique, using three-dimensional X-ray photographic data. The crystals are monoclinic with space groupP2₁/c, a = 9.26(2),b = 11.36(2),c = 8.66(2) Å and = 105.4(4) °. The structure was refined by the full-matrix least-squares methods to a finalR value of 0.10. The torsion angles defining the side-chain conformation ofdl-lysine hydrochloride are significantly different from those ofl-lysine hydrochloride.