(2-(2-Pyridyl)ethylidene)diphosphonic acid 2-(2-Pyridyl)ethylidine-1,1-bisphosphonate 75755-07-6 Acide piridronique [French] Acido piridronico [Spanish] Acidum piridronicum [Latin] Phosphonic acid, (2-(2-pyridinyl)ethylidene)bis- Piridronic acid Piridronic acid [INN]