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The title compound, C 21 H 23 NO 3 , is a phenyl­imine derivative of the well known anthelmintic agent α-santonin. The  trans -fused cyclo­hexane and γ-lactone rings of the α-santonin ring system adopt chair and envelope conformations, respectively, whereas the hexa­diene ring is approximately planar [maximum deviation = 0.029 (4) Å] and forms a dihedral angle of 62.30 (11)° with the benzene ring. An intra­molecular O—H⋯N hydrogen bond is observed.

8-[(2-Hydroxyphenyl)imino]-3,5a,9-trimethyl-3a,4,5,5a,8,9b-hexahydronaphtho[1,2-b]furan-2(3H)-one