Ald-PEG4-NHBoc linker contains a benzaldehyde group and a Boc protected amine group. Aldehyde readily react with hydrazide and aminooxy groups. After de-Boc, the free primary amine can react with carboxylic acids, activated NHS esters and other carbonyl compounds. The hydrophilic PEG linker can increase the water solubility of the compound.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.