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The title complex, [Sn2(CH3)4(C6H11NO5)2]·0.5C4H8O2, comprises the centrosymmetric cyclic dimeric SnIV complex and an uncoordinated, partially occupied, centrosymmetric dioxane mol­ecule. Each SnIV atom has a distorted octa­hedral six-coordinate configuration formed by the tridentate tricine ligand, one bridging O atom and two methyl groups. Within the cyclic dimer, the Sn...Sn separation is 3.6574 (4) Å. All H atoms of the NH and OH groups are involved in inter­molecular hydrogen bonds with the O atoms as acceptors. There are also important weak inter­molecular C—H...O hydrogen bonds, which link the mol­ecules of the dimer and dioxane into an infinite three-dimensional network.
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