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Gao, S. and Ng, S.W. and Zain, Sharifuddin Md and Zhao, J.G. and Huo, L.H. and Zhang, Z.Y. (2004) (4-Oxo-1,4-dihydropyridin-1-yl) acetic acid. Acta Crystallographica Section E: Structure Reports Online, 60 (6). o1006-o1008. ISSN 1600-5368, DOI https://doi.org/10.1107/S1600536804011110.