Synonyms: Phosphonicacid, (1-hydroxybutylidene)bis- (9CI); Phosphonic acid,(1-hydroxybutylidene)di- (7CI,8CI); 1-Hydroxy-1,1-diphosphonobutane;1-Hydroxybutane-1,1-diphosphonic acid; 1-Hydroxybutylidene-1,1-bisphosphonate;1-Hydroxybutylidene-1,1-diphosphonic acid;1-Hydroxybutylidene-1,1'-diphosphonic acid; 1-Hydroxybutylidenediphosphonicacid