N-(Methyltetrazine-PEG8-carbonyl)-N-bis(PEG8-acid) represents a branched PEG linker comprised of a methyltetrazine click chemistry handle for rapid conjugation with TCO-containing entities, and two carboxylic acid groups that can react with amine-containing entities via activators like HATU. The PEG branches improve the water-solubility of the molecule. The branched architecture supports the attachment of multiple ADC payloads or other entities.
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