(R)-3-{(1R,3aS,7aR)-4-[(R)-2-Methoxy-2-(2-methylene-bicyclo[3.1.0]hex-1-yl)-eth-(E)-ylidene]-7a-methyl-octahydro-inden-1-yl}-butyric acid methyl ester

methyl (3R)-3-((1R,3aS,7aR,E)-4-((2R)-2-((3S)-3-hydroxy-2-methylenebicyclo[3.1.0]hexan-1-yl)-2-methoxyethylidene)-7a-methyloctahydro-1H-inden-1-yl)butanoate

methyl (R)-3-((1R,3aS,7aR,E)-7a-methyl-4-((Z)-2-((S)-2-methylene-5-(tosyloxy)cyclohexylidene)ethylidene)octahydro-1H-inden-1-yl)butanoate

methyl (R)-3-((3S,9S,10R,13R,14R,17R)-3-acetoxy-10,13-dimethyl-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl)butanoate

methyl (R)-3-((1R,3aS,7aR,E)-4-((Z)-2-((3S,5R)-5-acetoxy-3-hydroxy-2-methylenecyclohexylidene)ethylidene)-7a-methyloctahydro-1H-inden-1-yl)butanoate