4-[(1-hydroxy-1-(4-methoxyphenyl)methyl)]-2-buten-4-olide

(Z)-4-(4-methoxybenzylidene)-2-butenolide

2,5-dihydrofuran-2-ol

4-(4-甲氧基苯基)-5H-呋喃-2-酮

4-氧代丁酸乙基酯