Christopher G. Newton, W. David Ollis, Michael L. Podmore and Derek E. Wright; Cyclic meso-ionic compounds. Part 21. The examination of nitro-derivatives of meso-ionic heterocycles as potential pharmaceuticals; J. Chem. Soc., Perkin Trans. 1, 1984, 63;
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http://dx.doi.org/10.1039/P19840000063