(1R,3R,4S)-4-(tert-butyldimethylsilyloxy)-3-[(tert-butyldimethylsilyloxy)methyl]-2-methylene-cyclopentyl formate

(3R,4S)-4-((tert-butyldimethylsilyl)oxy)-3-(((tert-butyldimethylsilyl)oxy)methyl)-2-methylenecyclopentanone

(3aS,4R,5S,6aR)-5-(tert-butyldimethylsilyloxy)-4-(tert-butyldiethylsilyloxy-methyl)-hexahydro-cyclopenta[b]furan-2-ol

(1S,2R,3S,5R)-2-(((tert-butyldimethylsilyl)oxy)methyl)-1-methyl-6-oxabicyclo[3.1.0]hexan-3-ol