1-Pyrrolidinecarboxylic acid, 3,4-dihydroxy-, 1,1-dimethylethyl ester, (3S,4S)-
1-Pyrrolidinecarboxylic acid, 3,4-dihydroxy-, 1,1-dimethylethyl ester, (3S-trans)-
1,1-Dimethylethyl (3S,4S)-3,4-dihydroxy-1-pyrrolidinecarboxylate
(3S,4S)-tert-Butyl 3,4-dihydroxypyrrolidine-1-carboxylate