Description Application This heterobifunctional, PEGylated crosslinker 2-(2-((7-(tert-butoxy)-7-oxoheptyl)oxy)ethoxy)acetic acid features a carboxyl group at one end and a t-butyl protected carboxylic acid at the other and exhibits both hydrophobic and hydrophilic moieties for use in biological applications. The linker can be used for bioconjugation or as a building block for synthesis of small molecules, conjugates of small molecules and/or biomolecules, or other tool compounds for chemical biology and medicinal chemistry that require ligation. Examples of applications include its synthetic incorporation into antibody-drug conjugates or proteolysis-targeting chimeras (PROTAC® molecules) for targeted protein degradation where the linker region is referred to as 2-2-6. Other Notes Modular PROTAC Design for the Degradation of Oncogenic BCR-ABL Technology Spotlight: Degrader Building Blocks for Targeted Protein Degradation Legal Information PROTAC is a registered trademark of Arvinas Operations, Inc., and is used under license