[4-(Diethoxy-phosphorylamino)-butyl]-phosphoramidic acid diethyl ester is a hydrophilic PEG derivative. Phosphonic acid ethyl ester is used for surface modification. The hydrophilic PEG linker can increase the solubility of a compound in aqueous media and improve the hydrophilicity of the surfaces.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.