4-Arm PEG-SH (MW 40000)

4-Arm PEG-SH (MW 40000) (4-Arm PEG-thiol (MW 40000) ) is a multi-arm PEG derivative featuring thiol groups at the end of its four arms. The reactive free thiol, SH or sulfhydryl groups, selectively interact with maleimide and surfaces of transition metals such as gold and silver.