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The two oxazolidine rings (A and B) of the title compound, C34H44N2O4, display roughly half-chair conformations, which could be described as twisted on the C-O bond. Together, the fused oxazolidine rings have a butterfly shape, with the H atoms attached to the ring junction C atoms in a cis orientation. The cyclo-hexane rings of both p-menthone fragments display chair conformations. The absolute configuration could not be determined from the X-ray diffraction data, but the relative configuration of the stereocentres could be deduced.

acta crystallographica. section e

(3R*,6R*,4′S*,8′R*,3′′R*,6′′R*)-3,3′′-Diisopropyl-6,6′′-dimethyl-2′,6′-diphenyldispiro[cyclohexane-1,4′-(3,7-dioxa-2,6-diazabicyclo[3.3.0]octane)-8′,1′′-cyclohexane]-2,2′′-dione