Used in research settings to study epigenetic regulation, particularly as a potent and selective inhibitor of the BET (bromodomain and extra-terminal) family of proteins. It is utilized to investigate gene expression control in diseases such as cancer, inflammation, and other conditions driven by dysregulated transcription. Its high selectivity makes it valuable for probing the biological roles of bromodomains without significant off-target effects, supporting the development of targeted therapies. Often employed in cellular and animal models to assess therapeutic potential and mechanism of action.