2-[(R)-5-((1aR,3aR,3bS,5aR,6S,8aS,8bS,10R,10aR)-10-Methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-1,1-dimethyl-hex-2-ynyloxy]-tetrahydro-pyran