ethyl 5-((S)-1-((1R,3aR,4S,7aR)-4-hydroxy-7a-methyloctahydro-1H-inden-1-yl)ethyl)furan-2-carboxylate

ethyl 5-((S)-1-((1R,3aR,7aR)-7a-methyl-4-oxooctahydro-1H-inden-1-yl)ethyl)furan-2-carboxylate

ethyl 5-((S)-1-((1R,3aR,7aR,E)-4-(bromomethylene)-7a-methyloctahydro-1H-inden-1-yl)ethyl)furan-2-carboxylate

ethyl 5-((S)-1-((1R,3aS,7aR,E)-7a-methyl-4-((4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)methylene)octahydro-1H-inden-1-yl)ethyl)furan-2-carboxylate

(20S)-[(5-ethyloxycarbonyl)furan-2-yl]-22,23,24,25,26,27-hexanor-1α-hydroxyvitamin D3