Crystal structure of flufenoxuron: a benzoyl-urea pesticide.

The title compound, C21H11ClF6N2O3 (systematic name: 1-{4-[2-chloro-4-(trifluoromethyl)phenoxy]-2-fluorophenyl}-3-(2,6-di-fluoro-benzo-yl)urea), is a benzoyl-urea pesticide. The dihedral angles between the central fluoro-benzene ring and the terminal di-fluoro-phenyl ring and chloro-phenyl ring system are 62.15 (5) and 88.03 (5)°, respectively. In the crystal, N-H⋯O hydrogen bonds link adjacent mol-ecules, forming R 2 (2)(8) inversion dimers that pack into loop chains along the a-axis direction by short F⋯F contacts [2.729 (2) Å]. In addition, the chains are linked by weak C-H⋯π and π-π inter-actions [inter-centroid distances = 3.661 (2) and 3.535 (12) Å], resulting in a three-dimensional architecture.