It is Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)HEDP
Synonyms:
1-Hydroxyethane-1,1-diphosphonic Acid;Etidronic
acid;HEDP;HEDPA;Hydroxyethylidene-1,1-Diphosphonic Acid; Hydroxy
Ethylidene-1,1-Diphosphonic Acid;1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid;1-Hydroxyethylidene diphosphonic
Acid;1-hydroxy ethylene-1,1-diphosphonic acid;1-HYDROXYETHYLIDENEDI
(PHOSPHONIC ACID);disodium (1-hydroxyethane-1,1-diyl)bis[hydrogen
(phosphonate)];(1-hydroxyethane-1,1-diyl)bis(phosphonate);