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Common supra molecular synthons in crystal engineering: (1) Carboxylic acid diamer (Homosynthon), (2) Carboxylic acid-pyridine (Heterosynthon), (3) Amide diamer (Homosynthon), (4) Carboxylic acid-amide (Heterosynthon), (5) Alcohol-ether (Heterosynthon).34
