methyl (2R,3S)-2,3-dihydroxy-3-[(2'R,3'R,4'R,5'S)-3',4'-dibenzyloxy-N-benzyloxycarbonyl-5'-tert-butyldiphenylsilyloxymethylpyrrolidin-2'-yl]propanoate

methyl (2S,3R)-2,3-dihydroxy-3-[(2'R,3'R,4'R,5'S)-3',4'-dibenzyloxy-N-benzyloxycarbonyl-5'-tert-butyldiphenylsilyloxymethylpyrrolidin-2'-yl]propanoate