邻硝基苯乙酮

4-(2-nitrophenyl)-2,4-dioxobutanoic acid ethyl ester

(2R)-2-hydroxy-4-(2-nitrophenyl)-4-oxobutyric acid ethyl ester

trans-4-(2-nitrophenyl)-4-oxo-but-2-enoic acid methyl ester

(S)-2-氨基-4-苯基丁酸乙酯