1,2-Pyrrolidinedicarboxylic acid, 4-hydroxy-, 1-(1,1-dimethylethyl) 2-ethyl ester, (2R,4R)-
1,2-Pyrrolidinedicarboxylic acid, 4-hydroxy-, 1-(1,1-dimethylethyl) 2-ethyl ester, (2R-cis)-
1-(1,1-Dimethylethyl) 2-ethyl (2R,4R)-4-hydroxy-1,2-pyrrolidinedicarboxylate
1-tert-Butyl 2-ethyl (2R,4R)-4-hydroxy-1,2-pyrrolidinedicarboxylate