ethyl 3-acetyl-tetrahydro-4,5-dioxo-2-(2-oxopropyl)furan-2-carboxylate

3-乙酰基-2,5-二氢-4-羟基-5-氧代-2-(2-氧代丙基)-2-糠酸乙酯

4-(3-hydroxybutanoyl)-3-methoxy-5-methylbenzoic acid

4-[(E)-丁-2-烯酰基]-3-甲氧基-5-甲基苯甲酸

2-hydroxy-6-methylterephthalic acid