Gravar-mail: Pseudosymmetry and high Z′ structures: the case of rac-(2R,2′R,5′S)-2-methyl-5′-[(1R,2R,5S,5′S)-1,4,4,5′-tetra­methyl­dihydro-3′H-3,8-dioxa­spiro­[bi­cyclo­[3.2.1]octane-2,2′-furan]-5′-yl]-3,4,1′,2′,3′,4′-hexa­hydro-[2,2′-bi­furan]-5(2H)-one

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