Received 5 November 2012
The base molecule of the title co-crystal, C7H10N2O2S·C7H6O3, is essentially planar, with a maximum deviation of 0.0806 (14) Å for all non-H atoms. The acid molecule is also nearly planar, with a dihedral angle of 8.12 (14)° between the benzene ring and the carboxy group. In the crystal, the acid molecules form an inversion dimer through a pair of O-HO hydrogen bonds with an R22(8) ring motif. The pyrimidine molecules are linked on both sides of the dimer into a heterotetramer via O-HN and C-HO hydrogen bonds with R22(8) ring motifs. The heterotetramers are further linked by weak C-HO hydrogen bonds, forming a tape structure along [1-10].
For general background to substituted pyrimidines, see: Hunt et al. (1980); Baker & Santi (1965); Holy et al. (1974). For 4-hydroxybenzoic acid, see: Vishweshwar et al. (2003). For related structures, see: Balasubramani & Fun (2009); Hemamalini & Fun (2010). For hydrogen-bond motifs, see: Bernstein et al. (1995). For bond-length data, see: Allen et al. (1987). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IS5216 ).
The authors thank the Malaysian Government and Universiti Sains Malaysia (USM) for the research facilities and Fundamental Research Grant Scheme (FRGS) No. 203/PFIZIK/6711171 to conduct this work. KT thanks the Academy of Sciences for the Developing World and USM for a TWAS-USM fellowship.
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