| Summary: | The title compound, C16H14F3N3OS·H2O, which had been previously characterized in the space group P-1 [Ren et al. (2011). Acta Cryst. E67, o270], has now been crystallized from 1-propanol in the monoclinic form in the space group P21/c. While the triclinic form is a Z′ = 2 crystal, the new monoclinic polymorph includes one main molecule and one water lattice molecule in the asymmetric unit. In the crystal, the water molecule is sandwiched between neighboring main molecules and behaves as both donor and acceptor in O—H...N and N—H...O hydrogen bonds with the imidazole N atoms. This pattern of chains parallel to [100] further interacts via O—H...N(pyridine) contacts.
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