t-Boc-N-amido-PEG3-sulfonic acid bears a Boc protected amine group and a sulfonic acid. The Boc can be removed under mild acidic conditions to free the amine, which can be undergo further amide coupling with acid and activated esters. The sulfonic acid can undergo esterification, halogenation and replacement reactions. The hydrophilic PEG spacer increases the aqueous solubility of the resulting compound in.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.