(3aS,4R,5S,6S,8R,9R,9aR,10R)-6-Ethenyl-4,6,9,10-tetramethyl-1-oxodecahydro-3a,9-propano-3aH-cyclopentacycloocten-5,8-diyl Diacetate (Mutilin 11,14-Diacetate)