2-hydroxy-3-(3-nitropyridin-2-yl)acrylic acid ethyl ester

3-(3-nitro-pyridin-2-yl)-2-oxo-propionic acid ethyl ester

ethyl (2Z)-2-hydroxy-3-(3-nitropyridin-2-yl)acrylate

丙酮酸乙酯

3-氨基-2-氯吡啶