m-PEG4-DBCO is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs. m-PEG4-NH-DBCO is a click chemistry reagent, it contains a DBCO group that can undergo strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules containing Azide groups.
m-PEG4-DBCO is a DBCO-activated reagents and can react with azides via a copper-free Click Chemistry reaction to form a stable triazole. This reagent can be applied to situations when copper is a concern for DBCO-activated PEGylation.