Azido-PEG-MMAE is a type of compound that belongs to the class of antibody-drug conjugates (ADCs) used in pharmaceutical research and development. This compound contains functional groups that make it suitable for drug delivery purposes. The azide group allows for chemical modifications, which can be used to attach the compound to other molecules or surfaces. The PEG group improves the solubility and bioavailability of the compound in the body, while the MMAE group is a potent cytotoxic agent that targets cancer cells. Azido-PEG-MMAE is commonly used in preclinical studies to evaluate the efficacy and safety of ADCs. Its introduction has revolutionized drug discovery by enabling the targeted delivery of drugs to specific cells or tissues, reducing systemic toxicity and increasing therapeutic efficacy.