N3-PEG3-VC-PAB-MMAF (Comp T-88-5) is a drug-linker conjugate for antibody-drug conjugates (ADCs) that comprises the ADC linker N3-PEG3-VC-PAB and the microtubule-disrupting agent MMAF [1]. This click chemistry reagent boasts an Azide group enabling it to participate in copper-catalyzed azide-alkyne cycloaddition (CuAAC) with Alkyne-bearing molecules. Additionally, it can engage in strain-promoted alkyne-azide cycloaddition (SPAAC) with compounds presenting DBCO or BCN groups.