4-Arm PEG-SH (MW 5000)
4-Arm PEG-SH (MW 5000) (4-Arm PEG-thiol (MW 5000)) is a multi-arm PEG derivative with thiol groups at each end of the four arms. The reactive free thiol, SH or sulfhydryl groups react selectively with maleimide and transition metal surfaces including gold and silver.