1,3-Bis(2-methylprop-2-enoyl)-1H-benz- imidazol-2(3H)-one

R factor = 0.057; wR factor = 0.208; data-to-parameter ratio = 12.5. The molecules of the title compound, C15H14N2O3, possesses crystallographically imposed twofold rotational symmetry, so the asymmetric unit contains one half-molecule. The fused-ring system deviates significantly from planarity; the planes of the five- and six-membered rings are twisted with respect to each other by 3.0 (1). In the crystal, weak C—H O hydrogen bonds link molecules related by translation in [010] into chains. Related literature For applications of substituted benzimidazoles, see: Gravatt et al. (1994); Srikanth et al. (2011). For the crystal structures o