What are the main uses of Aprepitant Impurity 19 (CAS: 78-69-3)?

Aprepitant Impurity 19 is primarily used in pharmaceutical research and development for the identification and quantification of impurities in aprepitant. It also plays a role in analytical testing to meet regulatory standards and ensure the safety and efficacy of the final drug product. Its use is limited to controlled laboratory environments and not for industrial or consumer applications.