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Title
Coordination Chemistry of [Nb<sub>2</sub>(S<sub>2</sub>)<sub>2</sub>]<sup>4+</sup> Clusters: Preparation and Crystal Structures of K<sub>4</sub>[Nb<sub>2</sub>(S<sub>2</sub>)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>4</sub>] · 6 H<sub>2</sub>O and (NH<sub>4</sub>)<sub>6</sub>[Nb<sub>2</sub>(S<sub>2</sub>)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>4</sub>](C<sub>2</sub>O<sub>4</sub>)