CBP/p300-IN-22 is a selective inhibitor of the CBP/EP300 bromodomain, with an IC50 of 4 nM. It exhibits high selectivity for BRD4(1) and reduces cytokine expression induced by TNF-alpha as well as subsequent immune cell recruitment by inhibiting NF-kappaB signaling, demonstrating anticancer properties. This compound is applicable for research into rheumatoid arthritis (RA) and other TNF-alpha-mediated inflammatory diseases.