Abstract
In the structure of the title compound, [Mg(C7H3N2O6)2(H2O)4]·4H2O, the slightly distorted octa-hedral MgO6 coord-in-ation polyhedron comprises two trans-related carboxyl-ate O-atom donors from mononodentate 3,5-dinitro-benzoate ligands, and four water mol-ecules. The coordinating water mol-ecules and the four water mol-ecules of solvation give both intra- and inter-unit O-H⋯O hydrogen-bonding inter-actions with carboxyl-ate, water and nitro O-atom acceptors, forming a three-dimensional structure.