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In the title compound, C 18 H 20 O 4 , both the tetra­hydro­pyran­one ring and the cyclo­hexene ring adopt envelope conformations. The crystal packing is stabilized by weak inter­molecular C—H⋯O hydrogen bonding.

Ethyl (4aR*,7S*,8S*,8aS*)-1-oxo-7-phenyl-3,4,4a,7,8,8a-hexahydro-1H-isochromene-8-carboxylate

Ethyl (4aR,7S,8S,8aS)-1-oxo-7-phenyl-3,4,4a,7,8,8a-hexahydro-1H-isochromene-8-carboxylate