2-{[5-(Pyridin-4-yl)-4-p-tolyl-4H-1,2,4-triazol-3-yl]meth­yl}acrylic acid hemi­hydrate

The asymmetric unit of the title compound, 2C₁₈H₁₆N₄O₂·H₂O, consists of two organic molecules and one solvent molecule. The symmetry-independent organic mol­ecules have slightly different conformations: the 1,2,4-triazole ring forms dihedral angles of 84.61 (4), 89.68 (5) and 22.38 (6)°, respectively, with the 2-propenecarbocylic, p-tolyl and 4-pyridyl groups in one independent molecule, and 71.35 (4), 82.13 (5) and 24.82 (6)°, respectively, in the second. In the crystal, mol­ecules ralated by the 2₁ screw axes are assembled via O—H...N and O—H...O hydrogen bonds into infinite chains and these are linked by further O—H...N hydrogen bonds into undulating sheets parallel to the bc plane. Adjacent sheets are connected by weak C—H...O inter­actions, forming a three-dimensional structure.