Small molecule inhibitor of the ATPase activity of myosin II; affects cell blebbing during cell division. Prepn and inhibition of non-muscle myosin II: A. F. Straight et al., Science 299, 1743 (2003). Prepn and crystal structure of (-)-form: C. Lucas-Lopez et al., Eur. J. Org. Chem. 2005, 1736. Crystal structure in complex with myosin II: J. S. Allingham et al., Nat. Struct. Mol. Biol. 12, 378 (2005). Kinetics of non-muscle myosin IIB inhibition: B. Ramamurthy et al., Biochemistry 43, 14832 (2004). Mechanism of myosin II inhibition: M. Kovács et al., J. Biol. Chem. 279, 35557 (2004). Photochemistry studies: J. Kolega, Biochem. Biophys. Res. Commun. 320, 1020 (2004); T. Sakamoto et al., Biochemistry 44, 584 (2005).