The title compound, 3,4,4a,10b-tetrahydro-3,4,8,10-tetrahydroxy-2-(hydroxymethyl)-9-methoxypyrano[3,2-c][2]benzopyran-6(2H)-one monohydrate, C14H16O9·H2O, crystallized in space group P212121 from methanol. The data collection was made at low temperature and the results obtained agree with those reported in another publication for the same compound determined at room temperature [Shang-Zhen, Hua, Xu-Wei, Zhong-Yuan & Guo-Zhi (1989). J. Struct. Chem. 8, 305–310]. However, there are small differences in the cell constants and some geometrical parameters.
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Caldas et al. (2002) studied this question.
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