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The acid–base reaction of 1,4-benzodioxane 2-carboxylic acid with calcium carbonate furnished the centrosymmetric title compound, [Ca(C 9 H 7 O 4 ) 2 (H 2 O) 4 ], in which the metal ion is octahedrally coordinated by two monodentate 1,4-benzodioxane 2-carboxylate ligands and four water molecules. In the crystal, O—H...O and C—H...O hydrogen bonds link the molecules into a three-dimensional network.

Tetraaquabis(2,3-dihydro-1,4-benzodioxine-2-carboxylato)calcium(II)