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The stereochemistry and regioschemistry ( exo ) of the title compound, C 15 H 18 O 5 , were determined by the X-ray analysis. The meth­oxy groups essentially lie in the plane of the benzene ring to which they are attached, as described by the C—O—C C torsion angles of −176.80 (12) and 4.67 (19)°. In the crystal, O—H⋯O hydrogen bonds and weak C—H⋯O hydrogen bonds link the mol­ecules, forming chains of  R   2   1 (8) rings along [010].

1-(3-Hydroxy-5,8-dimethoxy-4-methyl-1,2,3,4-tetrahydro-1,4-epoxynaphthalen-2-yl)ethan-1-one