doi:10.1107/S2053229624008015engPolo, ÁlvaroSoriano-Jarabo, AlejandroRodríguez, RicardoMacías, RamónGarcía-Orduña, PilarSanz Miguel, Pablo J.Revisiting a natural wine salt: calcium (2R,3R)-tar­trate tetra­hydrateART-2024-140387The crystal structure of the salt calcium (2R,3R)-tar­trate tetra­hydrate {sys­tem­atic name: poly[[di­aqua­[μ4-(2R,3R)-2,3-di­hydroxy­butane­dioato]calcium(II)] di­hydrate]}, {[Ca(C4H8O8)(H2O)2]·2H2O}n, is reported. The absolute configuration of the crystal was established unambiguously using anomalous dispersion effects in the diffraction patterns. High-quality data also allowed the location and free refinement of all the H atoms, and therefore to a careful analysis of the hy­dro­gen-bond inter­actions.2024http://zaguan.unizar.es/record/14552810.1107/S2053229624008015http://zaguan.unizar.es/record/145528oai:zaguan.unizar.es:145528info:eu-repo/grantAgreement/ES/DGA/E05-23Rinfo:eu-repo/grantAgreement/ES/DGA/E42-23Rinfo:eu-repo/grantAgreement/ES/MCIU-AEI-FEDER/PID2021-122406NB-I00info:eu-repo/grantAgreement/ES/MICINN/PID2022-137208NB-I00Acta Crystallographica Section C-Structural Chemistry 80, 10 (2024), 681-684byhttps://creativecommons.org/licenses/by/4.0/deed.esinfo:eu-repo/semantics/openAccess