R factor = 0.039; wR factor = 0.114; data-to-parameter ratio = 12.3. In the crystal structure of the title compound, C8H7NO3, molecules are linked through weak intermolecular C—H O hydrogen bonding. Related literature For the preparation, see: Johnson et al. (1991). For general background to supramolecular electron-transfer materials, see: Yagi et al. (2003); Ezoe et al. (2006); Normand-Bayle et al. (2005); Ward et al. (2005). For a related structure, see: Zhang et al. (2009)
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