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In the title hydrated mol­ecular salt, C 9 H 10 N 3 O + ·C 7 H 7 O 3 S − ·H 2 O, the cation is protonated at a quinazolinone N atom and an intra­molecular N—H⋯O hydrogen bond occurs. In the crystal structure, inter­molecular N—H⋯O and O—H⋯O hydrogen bonds and C—H⋯O, C—H⋯π and weak aromatic π–π stacking inter­actions [centroid–centroid separations = 3.8648 (12) and 3.9306 (13) Å] help to establish the packing; a short S=O⋯π contact is also seen.

3-Amino-2-methyl-4-oxo-3,4-dihydroquinazolin-1-iump-toluenesulfonate monohydrate