(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

Acetic acid (3aR,5S,6R,6aR)-2,2-dimethyl-5-(toluene-4-sulfonyloxymethyl)-tetrahydro-furo[2,3-d][1,3]dioxol-6-ylmethyl ester

(E)-(4R,5R,6R)-4,6-Dihydroxy-3-methyl-5-trityloxymethyl-oct-2-enoic acid methyl ester