10a-Hy-droxy-9-[2-(tri-fluoro-meth-yl)phen-yl]-3,4,5,6,7,8a,9,10a-octa-hydro-1H-xanthene-1,8(2H)-dione.

The title compound, C20H19F3O4, crystallizes with two independent mol-ecules with similar geometry. In both mol-ecules the tetra-hydro-pyran, cyclo-hexene and cyclo-hexane rings of the xanthene moiety adopt half-chair, half-boat and chair conformations, respectively. In the extended structure, O-H⋯O hydrogen bonds between hy-droxy and carbonyl groups link mol-ecules into chains propagating along [100].