(4R,5R)-4-benzyloxymethyl-5-but-3-enyl-2,2-dimethyl-[1,3]dioxolane

(1'R,2R)-2-(1',2'-bis-benzyloxyethyl)-5-methoxy-tetrahydrofuran

(1'R,3aR,5R,7aR)-5-(1',2'-dibenzyloxy-ethyl)-hexahydro-furo[3,2-b]pyran-2-one

(1'R,1''R)-3-[1'-(1'',2''-dibenzyloxyethyl)-4'-oxo-butoxy]-acrylic acid ethyl ester

(2'R,3'S,6'R,1''R)-[6'-(1'',2''-bis-benzyloxy-ethyl)-3'-hydroxy-tetrahydropyran-2'-yl]-acetic acid ethyl ester