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Structures with an intramolecular hydrogen bond for: (1) 1,2-Ethanediol; (2) Salicylic acid; (3) Hydroxy-benzoic acid; and (5) β-Alanine zwitterion. Conformations 2, 4, 6 prevent the formation of the intramolecular H-bond and are open for forming intermolecular hydrogen bonds.
