Crystal structures of two polymorphs of tixocortol pivalate.

Two polymorphs, () and (), of ()-{2-[(8,9,10,11,13,14,17)-11,17-dihy-droxy-10,13-dimethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-deca-hydro-1-cyclo-penta-[]phenanthren-17-yl]-2-oxoeth-yl} 2,2-di-methyl-propane-thio-ate, CHOS, have been identified. They are ortho-rhom-bic, non-centrosymmetric (222). The structures display layers of mol-ecules conected O-H⋯O hydrogen bonds along the axis direction in polymorph () and along the axis direction in polymorph ().