Received 16 March 2011
The whole molecule of the title compound, C23H14O6S, is disordered over two sets of sites with refined occupancies of 0.8733 (12):0.1267 (12). The dihedral angle between the mean planes through the chromene ring systems is 56.31 (5) and 55.2 (3)° for the major and minor components, respectively. In both components, a pair of intramolecular O-HO interactions generate rings of S(8) graph-set motif. In the crystal, the molecules are linked by intermolecular C-HO interactions, forming chains along the b axis. The structure is further stabilized by - interactions with centroid-centroid distances of 3.594 (2) and 3.608 (5) Å.
For the biological activity of 4-hydroxycoumarins, see: Abdelhafez et al. (2010); Huang et al. (2010); Jacquot et al. (2001); Kokil et al. (2010); Siddiqui & Asad (2010); Skulnick et al. (1997); Sullivan et al. (1943). For hydrogen-bond motifs, see: Bernstein et al. (1995).
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: RZ2575 ).
The authors are thankful to Universiti Sains Malaysia (USM) for providing the necessary research facilities and RU research funding under the grant No. 1001/PKIMIA/811134. MA also thanks Universiti Sains Malaysia for the award of post-doctoral fellowship. HKF and MMR thank USM for the Research University Grant (No. 1001/PFIZIK/811160).
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