In contrast to the solid-state, the 1H n.m.r. spectrum in D2O solution of the histamine univalent cation indicates that the –CH2CH2N+ side-chain has approximately equal proportions of the trans-rotamer and both gauche-rotamers.
A. F. Casy, R. R. Ison and N. S. Ham, J. Chem. Soc. D, 1970, 1343 DOI: 10.1039/C29700001343
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