title: Ethyl 4-(2,4-difluoro-phen-yl)-6-methyl-1-phenyl-2-thioxo-1,2,3,4-tetra-hydro-pyrimidine-5-carboxyl-ate.
abstract: The asymmetric unit of the title compound, C(20)H(18)F(2)N(2)O(2)S, contains four independent mol-ecules, two of which are paired into a dimer by way of two N-H⋯S hydrogen bonds. The other two independent mol-ecules are paired into two centrosymmetric dimers via pairs of inter-molecular N-H⋯S hydrogen bonds. In one mol-ecule, the carboxyl-ate O atoms, methyl-ene and methyl groups attached to the benzene ring are disordered between two positions in a 0.908 (3):0.092 (3) ratio. In two of the independent mol-ecules, the F and H atoms of the diflourophenyl ring are flip-flop disordered (i.e. by 180° about the C-C bond axis linking the ring to the rest of the molecule) in a 3:2 ratio. The crystal packing is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Samuel Robinson
authors.initials: SR
authors.lastname: Jebas
authors.forename: M
authors.initials: M
authors.lastname: Babu
authors.forename: B
authors.initials: B
authors.lastname: Kalluraya