The organic anion of the title compound, {[Na(C15H9O10S)(H2O)2]·H2O}n {systematic name: poly[[diaqua­[μ-2-(3,4-dihy­droxy­phen­yl)-3,5,7-trihy­droxy-4-oxo-4H-chromene-8-sulfon­ato]­sodium] monohydrate]}, has a nearly planar structure. The Na atom is six-coordinated by O atoms, two from water mol­ecules and four from the anion. The dihedral angle between the ring systems in the anion is 10.1 (1)°. Intra­molecular O—H⋯S and O—H⋯O inter­actions occur. In the crystal structure, an extensive network of classical inter­molecular O—H⋯S and O—H⋯O hydrogen bonds forms layers along the c axis.

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The title compound, C16H24O3, has a cage-type mol­ecular structure and is of inter­est with respect to its photochemical properties. The structure displays non-classical inter­molecular C—H⋯O hydrogen bonding, which links the mol­ecules into a three-dimensional network.

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