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In the crystal structure of the title compound, C5H14NO4P·H2O, the zwitterionic phospho­choline mol­ecules are connected by an O—H...O hydrogen bond between the phosphate groups, forming a zigzag chain along the b-axis direction. The chains are further connected through O—H...O hydrogen bonds involving water mol­ecules, forming a layer parallel to (101). Three and one C—H...O inter­actions are also observed in the layer and between the layers, respectively. The conformation of the N—C—C—O backbone is gauche with a torsion angle of −75.8 (2)°
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