(1-Hydroxy-2-(imidazo(1,2-a)-pyridin-3-yl)ethylidene)bisphosphonic acid monohydrate 1-Hydroxy-2-(imidazo(1,2-a)pyridin-3-yl)ethane-1,1-bisphosphonic acid monohydrate 127657-42-5 Phosphonic acid, (1-hydroxy-2-imidazo(1,2-a)pyridin-3-ylethylidene)bis- YH 529 YM 529 YM-529