Biotin-PEG-Thiol, MW 2K (Biotin-PEG-SH, MW 2K) is one of thiolated biotin polyethylene glycol derivatives with a free thiol group at one end of the PEG chain and a The terminal has a biotin molecule, which can react with maleimide by forming a thioether bond.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.