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Mr= 278.3, monoclinic, P21/c, a= 9.27 (1), b= 18.94 (2), c= 7.46 (1) A, fl= 97.3 (3), V= 1299 (3) A3, Z= 4, Dm= 1.465 (1), Dx= 1.423 (3) Mg m-3, 2 (Cu Ktx)= 1.5418 A,~ t (Cu Ka)= 2.28 mm-l, F (000)= 584, room temperature. The structure was determined by direct methods and refined to an R value of 0.065 for 1681 observed reflexions. The mean planes of the benzene and pyrimidine rings are inclined to each other at 78.1 (6). The geometry around the S atom is considerably distorted from the ideal tetrahedral geometry. The structure is stabilized by a network of three-dimensional hydrogen bonds and van der Waals forces.