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The title steroid, C 29 H 46 O 4 , is a furostene derivative with a C=C double-bond length of 1.353 (3) Å and an  E  configuration. The side chain is oriented toward the α face of the  A – E  steroidal nucleus and presents a disordered terminal CH 2 —OH group [occupancies for resolved sites are 0.591 (9) and 0.409 (9)]. The methyl group at C20 attached to ring  E  is also oriented toward the α face, avoiding steric hindrance with the carbonyl O atom of the acetyl group. The furostene and acetyl functionalities form an α,β-unsaturated ketone system, with an  s - cis  configuration. All hydr­oxy and carbonyl groups are involved in weak inter­molecular hydrogen bonds. The absolute configuration was assigned from the synthesis.

(E)-(25S)-23-Acetyl-5β-furost-22-ene-3β,26-diol