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An X-ray diffraction study of the title compound, C13H15NO4, has demonstrated that the formation of intra­molecular O—H...O=C hydrogen bonds leads to the lengthening of the carbon­yl C=O bonds, shortening of the (C=)C—O(—H) bond and delocalization of the electron density within the dihydro­pyridine ring.

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The title compound, C14H13NO5, exhibits a resonance-assisted hydrogen bond O—H...O=C [2.505 (4) Å], which leads to a lengthening of the carbonyl C=O bond, a shortening of the C—OH bond and delocalization of the electron density within the dihydro­pyridine ring.
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