Bis-BCN-PEG-diamide is a compound that belongs to the class of bisaryl 1,2,4,5-tetrazine derivatives. It contains several functional groups, including a bis(4-cyanophenyl)methane (BCN) group, a polyethylene glycol (PEG) linker, and a diamide group. The BCN group is a bioorthogonal reactive group that can be selectively and covalently linked with other bioorthogonal groups, such as tetrazines, azides, or cycloalkynes, to create stable covalent conjugates. The PEG linker provides water solubility and biocompatibility, while the diamide group enhances the stability of the compound. These properties make Bis-BCN-PEG-diamide a useful tool in pharmaceutical research and development, particularly in the design of targeted drug delivery systems and imaging agents.