The high purity Cbz-N-Amido-PEG4-CH2COOH CAS:1451362-51-8 provided by Axispharm is a peg derivative containing a Cbz-protected amine at one end and a carboxylic acid group at the other end. The PEG spacer increases solubility. It can be hydrogenated to remove the Cbz group to give a free amino group, which can be conjugated to biomolecules containing a carboxylic acid or its activated ester group.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.