Molecular structure of 3α-ethoxy-8α-acetoxy-13-hydroxy-lactar-6(7)en-5-oic acid γ-lactone

The structure of the title compound has been investigated in the solid state by X-ray diffraction. The crystals are tetragonal, space groupP4121,2 (No. 92), with cell dimensions:a=10.463(1),c=34.603(8)A. The structure was solved by direct methods and refined with 3634 unique reflections by a full-matrix, least-squares procedure givingR=0.0460,Rw=0.0472 (w=1/σ F 2 . The stereochemical analysis of the molecule confirmed the expectations based on earlier NMR investigations of the title compound and its precursors.