USP7/USP47 inhibitor (compound 14) is a selective inhibitor of USP7/USP47 with EC50s of 0.42 μM and 1 μM, respectively. USP7/USP47 inhibitor does not inhibit caspase 3, calpain 1, 20S proteasome, and a panel of representative USPs (USP2, USP5, USP8, USP21, and USP28; EC50 > 31.6 μM). USP7/USP47 inhibitor inhibits the growth of HCT-116 cells with an EC50 of 7.6 μM.