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In the title mol­ecule, C 17 H 20 O 8 , the two pyran rings form a dihedral angle of 61.2 (2)°. The two hy­droxy­methyl groups are each disordered over two sets of sites in a 0.764 (3):0.236 (3) ratio. In the crystal, O—H⋯O hydrogen bonds link the mol­ecules into layers parallel to the  ac  plane.

3,3′-Dihydroxy-6,6′-bis(hydroxymethyl)-2,2′-(pentane-1,1-diyl)di-4H-pyran-4-one