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The asymmetric unit of the title compound, C 40 H 60 O 5 S, comprises two diastereomers related, except for the chiral camphor groups, by a pseudo-inversion centre. In both diasteromers, the camphor sulfate moiety maintained the absolute configuartion ( R , S ) of the precursor. However, the absolute configurations at the methine C atoms are of opposite chirality. Both mol­ecules reveal intra­molecular O—H⋯O hydrogen bonds, whereas van der Waals inter­actions define the crystal packing.

acta crystallographica. section e

2,4-Di-tert-butyl-6-[(R/S)-1-(3,5-di-tert-butyl-2-hydroxyphenyl)ethyl]phenyl [(1R,4S)-7,7-dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl]methanesulfonate