Received 8 September 2009
The title compound, C12H11FO3S, was prepared by alkaline hydrolysis of ethyl 2-(3-ethylsulfanyl-5-fluoro-1-benzofuran-2-yl) acetate. In the crystal structure, the carboxyl groups are involved in intermolecular O-HO hydrogen bonds, which link the molecules into centrosymmetric dimers. These dimers are further packed into stacks along the b axis by aromatic - interactions between the furan ring and the benzene ring of neighbouring benzofuran ring systems [centroid-centroid distance = 3.684 (5) Å].
For the crystal structures of similar 2-(5-halo-1-benzofuran-2-yl) acetic acid derivatives, see: Choi et al. (2009a,b). For the pharmacological properties of benzofuran compounds, see: Howlett et al. (1999); Twyman & Allsop (1999).
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: ZQ2007 ).
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