Cbz-N-amido-PEG15-amine contains a Cbz protected amine and a free amine group. The amino group readily react with carboxylic acids and activated esters to form amide bond. It can also react with carbonyl groups such as ketone and aldehyde under reductive amination condition to form C-N bond. The Cbz group can be deprotected to form the free amine, which can then undergo a second amide coupling. The PEG spacer increases the aqueous solubility of the resulting compound.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.