Acta Cryst. (2013). E69, o616-o617
[ doi:10.1107/S1600536813007952 ]
Abstract: In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) Å from planarity and the cyclohexene ring exhibits a puckered conformation [puckering parameters QT = 0.452 (3) Å, = 57.0 (4) and = 131.7 (4)°]. The cyclohexene ring attached to the xanthene system adopts an envelope conformation, with the middle of the three methylene C atoms as the flap atom. In the crystal, O-HO and C-HO hydrogen bonds form infinite chains of R12(6) ring motifs along  with the xanthene groups arranged in an alternating zigzag manner.
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