Hydroxy PEG t-butyl esters

Hydroxy PEG t-butyl esters are multifunctional polyethylene glycol (PEG) linkers that feature a terminal hydroxyl (-OH) group and a tert-butyl ester moiety protecting a carboxylic acid. The hydroxyl group provides a site for further functionalization, while the t-butyl ester serves as a removable protecting group, allowing controlled, sequential conjugation strategies. These linkers are valuable in bioconjugation, drug delivery, and surface modification applications where PEG imparts solubility, flexibility, and biocompatibility.