(1R,2S,6R,8R)-8-hydroxy-4-thioxo-3,5,10-trioxa-tricyclo[6.2.1.0*2,6*]undecan-9-one

[(1S,3R)-3-[(tert-butyldimethylsilyl)oxy]-1-hydroxy-4-methylene]cyclohexanecarboxylic acid methyl ester

[(1S',3R')-3'-[(tert-butyldimethylsilyl)oxy]-1'-hydroxy-4'-methylene-cyclohexyl]methanol