Fmoc-tris-PEG3-DBCO functions as a branched PEG linker intermediate containing three DBCO moieties for copper-free click chemistry reactions with azide-bearing molecules. The Fmoc group can be deprotected under basic conditions to free the amine. The PEG3 arms bolster the flexibility and hydrophilicity of the compound. The branched structure supports the attachment of ADC payloads or other molecules.
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