N-Boc-N'-(PEG1-t-butyl ester)-L-Lysine-OH is the amino acid lysine with a Boc-protected α-amine and an amido-PEG1-t-butyl ester on its ε-amine. The carboxylic acid can be reacted with alcohols or amides, while the Boc and a t-butyl ester which can be later deprotected to perform further conjugation.
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