Synonyms: Phosphonicacid, [(2-hydroxy-1,3-propanediyl)bis[nitrilobis(methylene)]]tetrakis- (9CI);Phosphonic acid, [(2-hydroxytrimethylene)bis(nitrilodimethylene)]tetra- (7CI);2-Hydroxy-1,3-propylenediamine-N,N,N',N'-tetramethylenephosphonic acid;2-Hydroxypropylene-1,3-diamino-N,N,N',N'-tetrakis(methylenephosphonic acid);2-Hydroxypropylenediamine-N,N',N,N'-tetra(methylenephosphonic acid);2-Hydroxytrimethylenedinitrilotetrakisphosphonic acid; DPF 1