Synonyms: 1,2-Pyrrolidinedicarboxylicacid, 4-hydroxy-, bis(1,1-dimethylethyl) ester,(2S,4R)- (9CI); 1,2-Pyrrolidinedicarboxylic acid, 4-hydroxy-, bis(1,1-dimethylethyl) ester, (2S-trans)-;(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid di-tert-butylester; N-tert-Butoxycarbonyl-L-hydroxyproline tert-butyl ester