(2S)-2-[(1R,4E,7aR)-4-[(2E)-2-[(5S)-5-[tert-butyl(dimethyl)silyl]oxy-2-methylene-cyclohexylidene]ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]propan-1-ol