Synonyms : (1-hydroxyethylene)diphosphonic acid, (1-hydroxyethylene)diphosphonic acid, Tetrapotassium Salt, 1, 1-hydroxyethylenediphosphonate, 1-Hydroxyethane-1, 1-Diphosphonate, 1-Hydroxyethylidene-1, 1-Bisphosphonate, Dicalcium EHDP, Dicalcium Etidronate, Didronel, HEDP