Azido-PEG-CH2CO2H is a type of molecule that contains functional groups such as azido and carboxylic acid. These functional groups are important in pharmaceutical research and development because they allow for the modification and conjugation of molecules to create new drugs and therapeutics. Azido groups are particularly useful for bioconjugation reactions because they react selectively with terminal alkynes to form stable triazoles. Carboxylic acid groups are also important for conjugation reactions and can be used to activate molecules for further modification. Azido-PEG-CH2CO2H can be used to create drug delivery systems, biosensors, and imaging agents.