[(1R,2R,3R,4S)-2,3-Bis-benzyloxy-4-hydroxy-4-(4-methoxy-phenyl)-1-methyl-butyl]-carbamic acid tert-butyl ester

(2R,3R,4R,5R)-3-Hydroxy-4-methoxymethoxy-5-(4-methoxy-phenyl)-2-(toluene-4-sulfonyloxymethyl)-pyrrolidine-1-carboxylic acid methyl ester