UREZID : 3-(3,5-dimethylpyridin-1-ium-1-yl)-4-methyl-6-oxo-1,6-dihydropyridin-2-olate tetrahydrate Space Group: P 1 (2), Cell: a 7.4411(15)Å b 10.581(2)Å c 11.235(2)Å, α 108.96(3)° β 96.14(3)° γ 107.41(3)°Crystallographic data (CCDC 2057270) for the article: Mašulović, A. D., Lađarević, J. M., Radovanović, L. D., Vitnik, Ž. J., Vitnik, V. D., Rogan, J. R.,& Mijin, D. Ž. (2021). Charge assisted assembly of zwitterionic pyridone hydrates. Journal of Molecular Structure, Elsevier., 1237, 130419. [https://doi.org/10.1016/j.molstruc.2021.130419]The published version of the article: [https://cer.ihtm.bg.ac.rs/handle/123456789/4506]The peer-reviewed version of the article: [https://cer.ihtm.bg.ac.rs/handle/123456789/4507]Supporting information: [https://cer.ihtm.bg.ac.rs/handle/123456789/4508]Related crystallographic data (CCDC 2057269): [https://cer.ihtm.bg.ac.rs/handle/123456789/4509