4-Morpholinecarboxylic acid, 6-oxo-2,3-diphenyl-, 1,1-dimethylethyl ester, (2S,3R)-
4-Morpholinecarboxylic acid, 6-oxo-2,3-diphenyl-, 1,1-dimethylethyl ester, (2S-cis)-
1,1-Dimethylethyl (2S,3R)-6-oxo-2,3-diphenyl-4-morpholinecarboxylate
(2S,3R)-(+)-N-tert-Butoxycarbonyl-6-oxo-2,3-diphenylmorpholine