(2R,3S,4'S,5'R,2'E)-2-(4',5'-epoxyhexen)oyl-2-hydroxy-3-hydroxymethyl-4-butanolide-2,5-acetonide

(2S,3R)-3-tert-butyldimethylsiloxymethyl-2-tetrahydropyranyloxy-4-butanolide

(2S,3S,4'S,5'R,2'E)-2-(4',5'-epoxyhexen)oyl-2-hydroxy-3-tert-butyldimethylsilyloxymethyl-4-butanolide

(2R,3S,4'S,5'R,2'E)-2-(4',5'-epoxyhexen)oyl-2-hydroxy-3-tert-butyldimethylsilyloxymethyl-4-butanolide

(R)-4-(tert-Butyl-dimethyl-silanyloxymethyl)-3-[(E)-1-hydroxy-3-((2R,3S)-3-methyl-oxiranyl)-allyl]-3-(tetrahydro-pyran-2-yloxy)-dihydro-furan-2-one