Lithium phospho­enolpyruvate monohydrate at 85 K

The crystal structure of the title compound, lithium (1‐carboxy­ethenyl­oxy)­phospho­nate monohydrate, Li⁺·C₃H₄O₆P^?·­H₂O, is governed by lithium–oxy­gen interactions and hydrogen bonds. The Li⁺ cation is tetrahedrally coordinated by phosphate and water O atoms. The phospho­enolpyruvate monoanions form carboxyl‐to‐carboxyl and phosphate‐to‐water hydrogen bonds.