Acetic acid (3S,3aS,6R,7R,8R,8aS)-8-acetyl-7-(2-methanesulfonyloxy-ethyl)-3,6-dimethyl-2-oxo-octahydro-cyclohepta[b]furan-6-yl ester

Acetic acid (3S,3aS,6R,7R,8R,8aS)-8-acetyl-3,6-dimethyl-7-[2-(2-nitro-phenylselanyl)-ethyl]-2-oxo-octahydro-cyclohepta[b]furan-6-yl ester