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The title compound, C15H11N3O3·2H2O, crystallizes with ter­pyridine dioxide mol­ecules positioned on mirror planes in the space group Pnma. Catemeric assemblages of ter­pyridine mol­ecules [C—H...O—+N = 3.386 (4) Å] are linked by bridging water mol­ecules [C—H...O = 3.288 (4) and 3.386 (4) Å; O—H...O—+N = 2.837 (3) and 2.878 (4) Å], giving stacks of two-dimensional undulating motifs.
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