(4R,6S,E)-methyl 4,6-dihydroxy-6-((R)-2-thioxo-1,3-dioxolan-4-yl)hex-2-enoate

(4aR,5R,7S,7aR)-5,7-Bis-(tert-butyl-dimethyl-silanyloxy)-hexahydro-cyclopenta[c]pyran-3-one

methyl (4R,6S,E)-4,6-bis((tert-butyldimethylsilyl)oxy)-6-((R)-2-thioxo-1,3-dioxolan-4-yl)hex-2-enoate