Thiol-PEG-OH (HS-PEG-OH), MW 2K is a heterobifunctional PEG with a terminal thiol group, and the thiol moiety can also react with disulfide through a thiol-ene reaction in the presence of a photoinitiator compounds or olefin molecules.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.