(E)-(2'R,5S)-3-(5'-iodo-2'-tert-butyldimethylsilyloxy)pent-4'-enyl-2,5-dihydro-5-methylfuran-2-one; (S)-3-[(R)-2-(tert-butyldimethylsilanyloxy)-5-iodopent-4-enyl]-5-methyl-3,4-dihydro-5H-furan-2-one; (E
,5S,2R)-3-(2-(tert-butyldimethylsiloxy)-5-iodo-4-pentenyl)-5-methyl-2(5H)-furanone