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In the title compound, C9H10N4O4·H2O, the triazole ring is nearly planar. The 1,3-dioxane-4,6-dione ring exhibits a half-chair conformation. Two intra­molecular N—H...·O hydrogen bonds, with O...H distances of 2.23 (2) and 1.99 (2) Å, and two inter­molecular O—H...·N hydrogen bonds, with N...H distances of 1.92 (3) and 1.94 (4) Å, are observed.

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In the title compound, C10H10N4O4, the triazine ring is nearly planar. The 1,3-dioxane-4,6-dione ring exhibits a half-chair conformation. The mol­ecule is disordered and the structure has been refined using a split model.

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In the title compound, C14H15NO5, the 1,3-dioxane-4,6-dione ring exhibits a half-chair conformation. The amino H atom has one intra- and one inter­molecular contact to carbonyl O atoms, with O...H distances of 2.11 (2) and 2.31 (2) Å.

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In the title compound, C13H12BrNO4, the 1,3-dioxane-4,6-dione ring exhibits a half-chair conformation. The mol­ecules are linked by C—H...O hydrogen bonds. The amino H atom has one intra­molecular contact to a carbonyl O atom, forming a six-membered ring.
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