DL-valine NCA
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The crystal of N-carboxy-DL-valine anhydride (DL-valine NCA), C 6 H 9 NO 3 , has a similar layer structure to that observed in the crystal of L-valine NCA [Kanazawa, Ohashi & Sasada (1984). Acta Cryst. C40, 1094-1096]. However, the D and L molecules are connected alternately by N-H...O hydrogen bonds in each layer