BCN-exo-PEG7-maleimide is an ADC Linker containing 7 PEG units. BCN-exo-PEG7-maleimide contains the lyophilic bidentate macrocyclic ligand BCN, which allows for further synthesis of macrocyclic complexes. In click chemistry , BCN reacts with molecules containing azide groups to form stable triazoles in the absence of catalysts. Its maleimide group (-Maleimide) degrades in aqueous media and has been used in drug delivery studies.