Hexapotassium dihydrogen [hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonate; hmdtmpa-6k; Potassium Salt of HexaMethyleneDiamineTetra (MethylenePhosphonic Acid) HMDTMPAK6; HMDTMPA; Phosphonic acid,1,6-hexanediylbisnitrilobis(methylene)tetrakis-,hexapotassium salt