The title compound, C30H25NO2S, contains an isoxazolidine ring in a twist conformation with the spiro‐C [0.404 (2) Å] and the adjacent C atom [0.266 (2) Å] deviating from the plane of the remaining three atoms. The thiapyran ring adopts a sofa conformation, with the five C atoms in a common plane (r.m.s.d. = 0.033 Å) and the S atom deviating by 0.984 (2) Å from this plane.
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