Synonyms: Nickelate(3-), (N,N-bis((phosphono-kappaO)methyl)glycinato(5-)-kappaN,kappaO)-, potassium (1:3), (T-4)-;Tripotassium nickelous N-carboxymethylnitrilodi(methylenephosphonate);Nickelate(3-), (N,N-bis((phosphono-kappaO)methyl)glycinato(5-)-kappaN,kappaO)-, tripotassium, (T-4)-;Tripotassium (N,N-bis(phosphonomethyl)glycinato(5-))nickelate(3-);nickel(2+) potassium [bis(phosphonatomethyl)amino]acetate (1:3:1)