A Hec1/Nek2 inhibitor; inhibits proliferation in human breast, cervical, and leukemia cell lines with IC50 values of 1.7 and 2.1, 2.4, and 2.5 μM, respectively, for MDA-MB-231 and MDA-MB-468, HeLa, and K562 cells; co-precipitates with cellular Hec1; reduces Nek2 protein levels (at 6.25 μM); disrupts spindle formation; induces apoptosis,