phenyl 3-(3,4-dihydroxyphenyl)prop-2-enoate

2,2-dimethyl-5-[1-(4-methylphenyl)ethyl]-1,3-dioxane-4,6-dione

methyl 3-(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)propanoate

4-(4-氯苯基)-3-氧代丁酸乙酯

4-(4-硝基苯基)-3-氧代丁酸乙酯