In the crystal structure of the title mol-ecule, C 13H 18BrO 4P, the phospho-nate ring adopts a chair conformation. Mol-ecules are linked by an O - H⋯O hydrogen bond [O⋯O = 2.780 (3) Å] to form chains parallel to the c axis. Two C - H⋯O inter-actions help to stabilize the cr...