m-PEG3-S-PEG1-t-butyl ester is a PEG linker containing a t-butyl protected carboxyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The t-butyl protected carboxyl group (COOH) prevents self-coupling or polymerization under standard acid/amine or acid/hydroxyl coupling conditions. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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