An inhibitor of Drosophila Aurora B kinase (Ki = 0.36 μM); specific for Drosophila B kinase, with minimal inhibition of human or X. laevis Aurora B kinases at concentrations up to 100 μM; induces mitotic and cytokinesis defects in Drosophila Kc167 cells; prevents Drosophila S2 cells from assembling a contractile ring during cell division when used at a concentration of 40 μM