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  1. ; ; ; ; (, Acta Crystallographica Section E Crystallographic Communications)
    In the title compound, C10H8N2·2C6H5NO3, 4-nitrophenol and 4,4′-bipyridine crystallized together in a 2:1 ratio in the space groupP21/n. There is a hydrogen-bonding interaction between the nitrogen atoms on the 4,4′-bipyridine molecule and the hydrogen atom on the hydroxyl group on the 4-nitrophenol, resulting in trimolecular units. This structure is a polymorph of a previously reported structure [Nayak & Pedireddi (2016).Cryst. Growth Des.16, 5966–5975], which differs mainly due to a twist in the 4,4′-bipyridine molecule. 
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