16-(Azide-PEG6-ethylcarbamoyl)pentadecanoic-t-butyl ester is a hybrid PEG linker featuring an azide-PEG and an aliphatic t-butyl ester linked together at a central amide. Azides are click chemistry handle which are used to react with terminal alkynes or strained cyclooctynes while t-butyl esters can be hydrolyzed by strong acid to reveal a carboxylic acid.
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