methyl 1N-tert-butoxycarbonyl-4-exomethylene-pyrrolidine-(2R)-carboxylate

2,5-二铵双环[2.2.1]庚烷二氯化物

4,4-二氟脯氨酸

methyl (2S)-N-tert-butoxycarbonyl-4-difluoromethyleneprolinate

(2S,4R)-1-allyloxycarbonyl-4-methanesulfonyloxy-2-methoxycarbonylpyrrolidine