1984-15-2 6145-29-5 MDP sodium Medronic acid, sodium salt Methanebisphosphonic acid, sodium salt Methanediphosphonic acid, sodium salt Methylenebis(phosphonic acid) sodium salt Methylenebisphosphonic acid tetrasodium salt Methylenediphosphonic acid, sodium salt Phosphonic acid, methylenebis-, tetrasodium salt Sodium methylenediphosphonate