Abstract
In the title hydrate, C13H10N4O2S center dot H2O, the dihedral angles between the central pyrazole ring and its pendant phenyl and thiadiazole rings are 9.93 (8) and 4.56 (7)degrees, respectively. In the crystal, the components are linked by N-H center dot center dot center dot O, O-H center dot center dot center dot N and O-H center dot center dot center dot O hydrogen bonds, generating [100] chains incorporating R-4(4) (10) loops. A weak C-H center dot center dot center dot O interaction helps to consolidate the packing.