Organophosphorus Compounds [Chemical/Ingredient] Diphosphonates [Chemical/Ingredient] Organic compounds which contain P-C-P bonds, where P stands for phosphonates or phosphonic acids. These compounds affect calcium metabolism. They inhibit ectopic calcification and slow down bone resorption and bone turnover. Technetium complexes of diphosphonates have been used successfully as bone scanning agents. D004164 Bisphosphonates Diphosphonates N0000007707 C25774 C0012544 Diphosphonates 3508 M0006519