(2S,4R)-4-Hydroxy-1,2-pyrrolidinedicarboxylic Acid 1-(4-Nitrobenzyl) Ester

(2S-trans)-4-Hydroxy-1,2-pyrrolidinedicarboxylic Acid 1-[(4-Nitrophenyl)methyl] Ester; (2S,4R)-1-(p-Nitrobenzyloxycarbonyl)-4-hydroxyproline; trans-4-Hydroxy-1-(4-nitrobenzyloxycarbonyl)-L-proline;