DOTA-(t-Butyl)3-PEG5-amido-N-t-Boc is a PEG linker featuring a Boc group that can be removed under acidic conditions to reveal the free amine, and the DOTA is used as a chelating agent for cations. The t-butyl protected carboxyl group can be deprotected under acidic conditions. The PEG5 chain enhances the solubility of the compound in aqueous media.
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