Used primarily as a key intermediate in the synthesis of pharmaceuticals, especially in the development of peptide-based drugs and prodrugs. Its structure allows for selective functionalization, making it valuable in creating biodegradable linkers and spacers that improve drug solubility and bioavailability. Commonly employed in controlled release systems due to its ability to form ester and amide bonds that are cleaved under physiological conditions. Also utilized in the design of polymer-drug conjugates for targeted delivery, particularly in oncology and anti-inflammatory therapies. Its polyether and amino acid-like features support compatibility with biological systems, reducing immunogenicity and enhancing stability.