diethyl N-(diphenylmethylene) aminomethyl phosphonate
diethyl N-(benzylidene)-aminomethylphosphonate
[(4-bromo-2-nitro-phenylamino)-methyl]-phosphonic acid diethyl ester
[(3-chloro-2-nitro-phenylamino)-methyl]-phosphonic acid diethyl ester
[(2-chloro-6-nitrophenylamino)methyl]phosphonic acid diethyl ester