CBZ-aminooxy-PEG-acid is a compound that belongs to the class of PEGylated small molecules. This compound contains several functional groups, including a carbamate group, an aminooxy group, and a carboxylic acid group. The carbamate group provides stability to the molecule, while the aminooxy group can be used for the conjugation of various molecules, including proteins and peptides. The carboxylic acid group provides an acidic environment, which is often necessary for the stability of some compounds. CBZ-aminooxy-PEG-acid is used in pharmaceutical research and development due to its ability to improve the pharmacokinetics and pharmacodynamics of drugs. The PEGylated small molecules have shown improved bioavailability, solubility, and reduced immunogenicity, making them an attractive option for drug delivery systems.