The X-ray structure analysis of the title compound, C25H25NO5S, establ
ishes unambiguously the absolute configuration of the asymmetric C ato
ms as R (C9) and R C(10), with the hydroxyl and phenyl substituents in
cis positions. The heterocyclic ring exhibits a flattened sofa confor
mation. The crystal structure shows an intramolecular hydrogen bond be
tween the hydroxyl group and the carbonyl O atom.