(1-Hydroxyethylidene)bisphosphonic acid, potassium salt 1-Hydroxylethanediphosphonic acid, potassium salt 67953-76-8 EINECS 267-956-0 Hydroxyethylidene diphosphonic acid, potassium salt Phosphonic acid, (1-hydroxyethylidene) bis-, potassium salt Phosphonic acid, (1-hydroxyethylidene)bis-, potassium salt