Diethyl phosphonomethanol, Diethyl Phosphonometanol, (Hydroxymethyl)phosphonic acid diethyl ester, (Hydroxymethyl)phosphonic acid diethyl ester Diethyl phosphonomethanol, 4-Hydroxymethyldiethylphosphonate, Diethyl (Hydroxymethyl)phosphonate, AURORA KA-1421, diethyl hydroxy-methanephosphonate, Diethyl(hydroxymethyl)phosphonate