(4-nitrophenyl carbonate)-PEG8-t-butyl ester is a PEG linker with a nitrophenyl group linked to a carbonate, eight PEG units, and a t-butyl ester group that can be deprotected under acidic conditions. The PEG units enhance the solubility of the molecule in aqueous media. Nitrophenyl group is reactive towards the amino-containing molecules.
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