BN82002 is a potent, selective and irreversible inhibitor of CDC25 phosphatase family. BN82002 inhibits CDC25A, CDC25B2, CDC25B3, CDC25C CDC25A, and 25C-cat with IC 50 values of 2.4, 3.9, 6.3, 5.4, and 4.6 µM, respectively. BN82002 displays ~20-fold greater selectivity over CD45 tyrosine phosphatase.