(1S,3aR,7aR)-3a-Hydroxy-7a-methyl-4-[(R)-2-(4,6,7,8-tetrahydro-benzo[1,3]dioxin-8a-yl)-ethyl]-5-trimethylsilanyloxy-2,3,3a,6,7,7a-hexahydro-1H-indene-1-carbonitrile