(2R,3S)-2-(tert-butyldimethylsilyloxymethyl)-6-ethoxy-3-hydroxy-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester

(2R,3R)-2-(tert-butyldimethylsilyloxymethyl)-6-ethoxy-3-hydroxy-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester

(2R)-2-(tert-butyldimethylsilyloxymethyl)-6-ethoxy-3-oxo-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester

(R)-[2-(tert-butyl-dimethyl-silyloxy)-1-furan-2-yl-ethyl]-carbamic acid benzyl ester

(2R)-2-(tert-butyldimethylsilyloxymethyl)-6-hydroxy-3-oxo-3,6-dihydro-2H-pyridine-1-carboxylic acid benzyl ester