Fig. 1
From: Bisphosphonate use in the horse: what is good and what is not?
Clinically-used bisphosphonates. The general bisphosphonate chemical structure with potential subgroup substitutions is shown in comparison with endogenous pyrophosphate. Individual non-nitrogen bisphosphonate structures (Tiludronate and Clodronate) are shown in comparison to two of the nitrogen-containing bisphosphonate structures (Pamidronate and Zoledronate)