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The crystal structure of 4-nitrobenzamide pyrazinecarboxamide (1 ∶ 1) contains two homomeric amide⋯amide dimers, which is in sharp contrast with the structural motifs displayed by the vast majority of binary co-crystals (illustrated here with five new examples), where the driving force for the supramolecular assembly is one or more strong heteromeric intermolecular interactions.
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Aakeröy et al. (2004) studied this question.
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