SEARCH Articles Figures Tables 1 -Hydroxyethane-1,1 -diphosphonic acid 1 -Hydroxyethylidene-1,1 -diphosphonic acid 1-Hydroxyethane-l,1-diphosphonic acid Diphosphonates Diphosphonic acid esters Ethane-1,1-diphosphonic acid Propane-1,2-diphosphonic acid