4-(3-ethoxy-3-oxoprop-1-enyl)-3-nitrobenzoic acid

2-氧代-1,2,3,4-四氢喹啉-7-羧酸乙酯

4-(2-methoxycarbonylethyl)-3-nitrobenzoic acid

3-(4-carboxy-2-nitro-phenyl)-propionic acid

3-(4-异丙苯基)丙酸