Crystal and molecular structure of desmodin

The crystal structure of the title compound has been determined from X-ray diffraction. The compound crystallizes from benzene in the orthorhombic sys tem, space group P2(1)2(1)2(1), with unit cell parameters: a = 8.485(2), b = 9.816(2), c = 22.597(4) Angstrom, Z = 4, V = 1881.9(7) Angstrom (3). The structure was determined by direct methods: and refined to a final R-factor of 0.04. Six membered rings B and E are planar. Ring A and ring C are in s lightly distorted sofa conformation. Ring D is in envelope conformation. Th e structure is stabilised by weak intermolecular C-H . . .O hydrogen bonds.