X-Ray analysis of N(α)-t-butoxycarbonyl-N(π)-benzyloxymethyl-L-histidine hydrate has confirmed that the im-protecting group is located on the π-nitrogen atom, in agreement with deductions from n.m.r. coupling constants.
T. Brown, J. H. Jones and J. D. Wallis, J. Chem. Soc., Perkin Trans. 1, 1982, 3045 DOI: 10.1039/P19820003045
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