(4S,1'R,3'S)-2,2-dimethyl-4-[5'-oxo-1'-(triethylsilanyloxy)-3'-(triisopropylsilanyloxy)-pentyl]-oxazolidine-3-carboxylic acid tert-butyl ester

(2'S,4'R,6'R)-[6'-{2-(4-methoxybenzyloxymethyl)-oxazol-4-yl}-4'-(triisopropylsilanyloxy)-tetrahydropyran-2'-yl]-acetic acid ethyl ester

(4S,1'R,3'R)-2,2-dimethyl-4-[1'-(triethylsilanyloxy)-3'-(triisopropylsilanyloxy)-hex-5'-enyl]-oxazolidine-3-carboxylic acid tert-butyl ester

((2S,4R,6R)-6-{(R)-1-[2-(4-Methoxy-benzyloxy)-acetylamino]-2-oxo-ethyl}-4-triisopropylsilanyloxy-tetrahydro-pyran-2-yl)-acetic acid ethyl ester

(1S,2'S,4'R,6'R)-[6'-{2-hydroxy-1-[2-(4-methoxybenzyloxy)-acetylamino]-ethyl}-4'-(triisopropylsilanyloxy)-tetrahydropyran-2'-yl]-acetic acid ethyl ester