(6R)-6-[(1R,3aR,4E,7aR)-4-[(2Z)-2-[(5R)-5-hydroxy-2-methylidene-cyclohexylidene]ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-2-methyl-heptane-2,4-diol