Product Description
4-Arm-PEG-maleimide (4-Arm PEG-MAL) is a multiarm PEG derivative with maleimide groups at each terminal of the four arms connected to one pentaerythritol core. The maleimide group selectively reacts with free thiol, SH, sulfhydryl, or mercapto group via Michael addition to form a stable carbon sulfur bond. 4-Arm PEG-MAL can be used for site specific protein and peptide modification.
