(5R,2'R)-3-(benzyloxy)-5-[2'-(tert-butyldimethylsilyloxy)but-3'-enyl]-4-(benzoyloxymethyl)furan-2(5H)-one

(1R,4R,6R,7R,9R)-9-benzoyloxymethyl-7-(tert-butyldimethylsilyloxy)-4-hydroxy-2-oxa-tricyclo[4.2.1.0(4,9)]nonan-3-one

methyl (5R)-5-hydroxy-3-oxo-6-heptenoate

methyl (3R,5R)-3,5-dihydroxy-6-heptenoate