Received 11 July 2013
In the title molecule, C18H16O7, the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap. The furan ring is almost coplanar with the pyran ring, with a dihedral angle of 1.04 (10)° between the planes, and it makes a dihedral angle of 67.97 (11)° with the mean plane of the dioxolane ring. The latter makes a dihedral angle of 67.15 (10)° with the pyran ring. The O atom attached to the pyran ring deviates by -0.009 (1) Å. The crystal packing features C-HO hydrogen bonds, forming a three-dimensional structure. The methoxycarbonyl atoms are disordered over two positions, with a refined occupancy ratio of 0.508 (18):0.492 (18).
For the biological importance of 4H-chromene derivatives, see: Cai (2007, 2008); Cai et al. (2006); Caine (1993); Gabor (1988); Brooks (1998); Valenti et al. (1993); Hyana & Saimoto (1987); Tang et al. (2007). For conformational analysis, see: Cremer & Pople (1975).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); 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 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2622 ).
ZF,TS and DV thank the TBI X-ray facility, CAS in Crystallography and Biophysics, University of Madras, India, for data collection and UGC (SAP-CAS) is acknowleged for the departmental facilties. ZF also thanks the UGC for a meritorious fellowship and TS thanks DST Inspire for a fellowship.
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