Tris[[2-(tert-butoxycarbonyl)ethoxy]methyl]methylamine, a cleavable PEG ADC linker, is employed in the synthesis of antibody-drug conjugates (ADCs). It is also a PEG-based PROTAC linker, specifically Amino-Tri-(t-butoxycarbonylethoxymethyl)-methane, widely used in the synthesis of PROTACs[1].