N-(Mal)-N-bis(PEG8-Val-Cit-PAB-MMAE) is a PEG linker with two branches, each comprised of a cathepsin-cleavable Val-Cit dipeptide and cytotoxic MMAE payload, which are attachable to monoclonal antibodies for targeting cancer. The terminal maleimide can be cysteine conjugated to a biomolecule. The PEG chains elevate the water solubility of the compound.
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