Attempts to prepare 1 : 1 co-crystals of caffeine and piracetam with 4-hydroxybenzoic acid have led to the serendipitous discovery of hydrates of a previously unknown 1 : 1 co-crystal of caffeine and 4-hydroxybenzoic acid, and a known 1 : 1 co-crystal of piracetam and 4-hydroxybenzoic acid.
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Aitipamula et al. (2012) studied this question.
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