(S)-2-[(3aR,5S,6R,6aR)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-6-(2-hydroxy-ethyl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl]-2-methoxy-ethanol

(3R,3aS,6R,6aS)-3a-Acetoxymethyl-5-(2,2-dimethyl-propionyloxy)-2,3-dihydroxy-6-methoxy-3,3a,6,6a-tetrahydro-2H-cyclopenta[b]furan-4-carboxylic acid methyl ester

(S)-2-(tert-Butyl-diphenyl-silanyloxy)-1-[(3aR,5S,6R,6aR)-6-(2-hydroxy-ethyl)-2,2-dimethyl-6-vinyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl]-ethanol

(3R,4S,5S)-5-Acetoxymethyl-4-(tert-butyl-dimethyl-silanyloxy)-3-methoxy-2-methoxymethoxy-5-methyl-cyclopent-1-enecarboxylic acid methyl ester

(R)-[(3aR,5S,6R,6aR)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-6-methoxycarbonylmethyl-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl]-methoxy-acetic acid methyl ester