(2R,4R)-4-氨基-2,4-吡咯烷二甲酸

(2R,4r)-1-苄基-4-氨基-吡咯烷-2,4-二羧酸

(2R,4R) diethyl-4-(tert-butyloxycarbonylamino)-1-(3-chlorobenzyl)pyrrolidine-2,4-dicarboxylate

(2R,4R) diethyl-4-(tert-butyloxycarbonylamino)-1-(3,3-diphenylpropyl)pyrrolidine-2,4-dicarboxylate

(2R,4R) diethyl-4-(tert-butyloxycarbonylamino)-1-(diphenylmethyl)pyrrolidine-2,4-dicarboxylate