Bocaminooxyacetamide-PEG3-alkyne, a cleavable 3-unit PEG ADC linker, plays a crucial role in the synthesis of antibody-drug conjugates (ADCs) [1]. This compound also functions as a click chemistry reagent due to its Alkyne group, enabling it to undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with Azide-containing molecules.