((3aR,5R,6R,6aR)-5-Ethyl-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl)-methanol

(3R,4S,5R)-5-Ethyl-3-hydroxy-4-hydroxymethyl-dihydro-furan-2-one

(3R,4S,5R)-5-Ethyl-3-hydroxy-4-trityloxymethyl-dihydro-furan-2-one

(E)-(4R,5R)-5-Hydroxy-2-methyl-4-trityloxymethyl-hept-2-enal