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The title 1,4-photoadduct, C21H19NO3, was formed on irra­diation of N-benzoyl­phthal­imide in di­chloro­methane con­tain­ing cyclo­hexene. The bond lengths and angles are generally within the normal ranges. A notable feature of the mol­ecule is the presence within it of four contiguous chiral centres.

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The title compound, C14H8Cl4O2, has been isolated following irradiation of a dichloro­methane solution of N-acetyl­tetra­chloro­phthalimide and cyclo­hexene. The structure refinement is slightly compromised by the disorder over two positions of equal occupancy of a methyl­ene group β to the spiro C atom.
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