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In the title compound, C 25 H 36 N 2 O 2 , the two  tert -butyl-substituted benzene rings are inclined at an angle of 53.5 (3)° to one another. The imidazolidine ring has an envelope conformation with with one of the C atoms of the ethylene fragment as the flap. The structure displays two intra­molecular O—H⋯N hydrogen bonds that generate  S (6) ring motifs. The crystal studied was a non-merohedral twin with a fractional contribution of 0.281(6) for the minor domain.

4,4′-Di-tert-butyl-2,2′-[imidazolidine-1,3-diylbis(methylene)]diphenol