3-(m-PEG8-ethoxycarbonyl)propanoic-NHS ester contains an NHS ester. This NHS ester linker can be used to label primary amines bearing biomolecules. The mPEG modification 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.