(1R,4R)-2-(4-tolylsulfonyl)-5-(phenylmethyl)-2,5-diazabicyclo[2.2.1]heptane

(2R,4R)-2-ethoxycarbonyl-4-hydroxypyrrolidine hydrochloride

4-(acetyloxy)-1-[(4-methylphenyl)sulfonyl]-D-proline ethyl ester

allo-1-(4-tolylsulfonyl)-4-[[(4-methylphenyl)sulfonyl]oxy]-D-proline ethyl ester

(2S,4R)-2-Hydroxymethyl-4-hydroxy-1-(4-toluenesulfonyl)-pyrrolidine