BCN-endo-PEG-Maleimide is a type of compound that belongs to the family of PEG-maleimide derivatives. It is commonly used in pharmaceutical research and development due to its functional groups, which enable it to attach to biomolecules such as proteins, peptides, and antibodies. BCN-endo-PEG-Maleimide contains two functional groups, namely maleimide and BCN, which enable it to form stable covalent bonds with cysteine residues on proteins. This makes it an ideal choice for conjugation reactions, where it can be used to modify the properties of biomolecules for various applications such as drug delivery, diagnostics, and imaging.