EtO-cBu-Cit-PAB-PNP is a cleavable antibody-drug conjugate (ADC) linker component containing an ethyl-protected cyclobutane-1,1-dicarboxamide (cBu) trigger, a citrulline (Cit) amino acid residue, a p-aminobenzyl (PAB) self-immolative spacer, and a p-nitrophenyl carbonate (PNP) active group.
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