This compound is widely used in organic synthesis, particularly in the development of pharmaceuticals and bioconjugates. It serves as a protective group for carboxylic acids, ensuring selective reactions during complex molecule assembly. Its PEG (polyethylene glycol) spacer enhances solubility and stability, making it valuable in drug delivery systems. Additionally, it is utilized in peptide synthesis to improve yield and purity. The t-butyl ester group provides temporary protection, which can be easily removed under mild conditions, allowing for precise control in multi-step reactions. Its versatility makes it a key reagent in medicinal chemistry and material science.