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In the title di­hydro­dioxin, C31H28O5, the dioxane ring has a chair conformation, whereas each of the pyran and dioxine rings has an envelope conformation with methyl­ene and quaternary C atoms, respectively, being the flap atoms. The phenyl rings are cis and form a dihedral angle of 82.11 (10)°. The molecular structure is stabilized by C—H...O contacts. In the crystal packing, supra­molecular layers parallel to (101) are sustained by C—H...π inter­actions.
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