4-methyl-2-ketoglutaric acid

diethyl (2S,4S)-2-methyl-4-(4-nitrobenzamido)pentanedioate

1-(tert-butyl) 2-methyl (2S)-4-methyl-5-oxopyrrolidine-1,2-dicarboxylate

甲基丙烯酸甲酯

甘氨酸