(2S,4R)-1-BOC-4-METHANESULFONYLOXY-PROLINE

(2S,4R)-4-Methanesulfonyloxy-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester

(2S,4R)-4-[(Methylsulfonyl)oxy]-1,2-pyrrolidinedicarboxylic acid 1-(1,1-dimethylethyl) ester