N-p-toluenesulphonyl(5-diphenyl-tert-butylsilyloxymethyl)-2-hydroxypyrrolidine

(1R,6R)-vinyl 2-acetyl-9-azabicyclo[4.2.1]non-2-ene-9-carboxylate

(R)-2-吡咯烷酮-5-甲酸甲酯

1-benzyl 2-methyl (R)-5-oxopyrrolidine-1,2-dicarboxylate