(1R,3aS,7aR)-4-[2-[(3S,5R)-3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-2-methylene-cyclohex-(Z)-ylidene]-eth-(E)-ylidene]-1-((1R,4R)-4-ethyl-1,5-dimethyl-hexyl)-7a-methyl-octahydro-indene