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The title compound, C 22 H 15 ClO 4 , containing three chiral C atoms, is an inter­mediate in the design of chiral alcohols. In the crystal structure, a chain structure is generated through C—H⋯O contacts and an intramolecular C—H⋯O interaction also occurs. The dihedral angle between the benzene ring and the naphthalene system is 16.5°.

13c-(2-Chloroethoxy)-1,13c-dihydro-2,3-epoxydibenzo[a,kl]xanthan-1-one