Acta Cryst. (2013). C69, 896-900 [ doi:10.1107/S0108270113017423 ]
Synopsis: A new polymorph of bis(2-aminopyridinium) fumarate-fumaric acid (1/1), determined using powder X-ray diffraction data, is described. The similarities and differences in hydrogen bonds between the new and previous polymorph are discussed in order to understand the polymorphism of the title salt.
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