1-Hydroxyethane-(1,1-di-phosphonic acid) (HEDP)
Amino-tris(methylene phosphonic acid) (ATMP)
Diethylenetriamine-penta(methylene phosphonic acid) (DTPMP)
Ethylendiamine-tetra(methylene phosphonic acid) (EDTMP)
Hydroxyethylamino-di(methylene phosphonic acid) (HEMPA)
Hexamethylenediamine-tetra(methylene phosphonic) acid (HDTMP)
2-Phosphonobutane-1,2,4-tricarboxylic acid (PBTC)
Special phosphonic acids