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The crystal structure of indole-3-carboxylic acid, C9H7NO2, shows the presence of centrosymmetric hydrogen-bonded cyclic carboxylic acid dimers [OO = 2.649 (2) ŝ. These dimers are linked into a sheet structure through peripheral intermolecular hydrogen bonds between the carboxylic acid groups and the hetero-amine group of the n-glide-related indole ring [ON = 3.013 (2) ŝ.
ACTA Crystallographica Section E - Structure Reports Online
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