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  • Title: Quinoline-4-carboxylic acid.
    Author: Dobson AJ, Gerkin RE.
    Journal: Acta Crystallogr C; 1998 Dec 15; 54 ( Pt 12)():1883-5. PubMed ID: 9921693.
    Abstract:
    The title acid, C10H7NO2, crystallized in the centrosymmetric space group P2(1)/c with one molecule in the asymmetric unit. There is a single hydrogen bond. O-H...N, with a donor-acceptor distance of 2.596 (1) A. The carboxylic H atom is ordered. The dihedral angle between the best-fit quinoline core plane and the carboxyl plane is 45.9 (1) degrees. Structural comparisons are made with the closely related molecule 2-phenylquinoline-4-carboxylic acid.
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