Azide-PEG5-c18-t-butyl ester is a PEG linker with a steric acid tail and a terminal azide group. Stearic Acid is a saturated long-chain fatty acid with an 18-carbon backbone. Azido group will react with DBCO, BCN or other Alkyne group through click chemistry. The PEG spacer increases aqueous solubility.
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