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In the title compound, C 27 H 30 O 6 , also known as sofalcone, an anti-ulcer agent used for the protection of gastric mucosa­, the two benzene rings form a dihedral angle of 6.78 (11)°. Inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers, which are further linked by weak C—H⋯O inter­actions into ribbons propagated in [2    0]. Finally, π–π inter­actions between the benzene rings [centroid–centroid distance = 3.583 (13) Å] stabilize the crystal packing.

2′-Carboxymethoxy-4,4′-bis(3-methylbut-2-enyloxy)chalcone