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m-PEG7-4-nitrophenyl carbonate is a PEG linker with a nitrophenyl carbonate group. The nitrophenyl carbonate is a good leaving group and can react with the amine groups of lysine residue by forming a stable urethan linkage.

m-PEG7-4-nitrophenyl carbonate is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1].

PEGs; Alkyl/ether

[1] An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562 DOI:10.1016/j.ebiom.2018.09.005