title: Ethyl 4-{2,6-dichloro-4-[3-(2,6-difluoro-benzo-yl)ureido]phen-oxy}butanoate.
abstract: The title compound, C(20)H(18)Cl(2)F(2)N(2)O(5), is considered to belong to the fourth generation of insecticides with properties such as high selectivity, low acute toxicity for mammals and high biological activity. An intramolecular N-H⋯O hydrogen bond results in the formation of a six-membered ring. In the crystal structure, intermolecular N-H⋯O and C-H⋯F hydrogen bonds link the molecules.
authors.affiliation: Department of Applied Chemistry, College of Science, Nanjing University of Technolgy, Xinmofan Road No. 5, Nanjing 210009, People's Republic of China.
authors.forename: Yin-Hong
authors.initials: YH
authors.lastname: Liu
authors.forename: Fang-Shi
authors.initials: FS
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Da-Sheng
authors.initials: DS
authors.lastname: Yu
authors.forename: Chui
authors.initials: C
authors.lastname: Lu