4-(4-甲氧基-苄基)-2-亚甲基琥珀酸酯

Propanoic acid anion

4-amino-2-methylidene-4-oxobutanoic acid

5,8-dimethoxy-4-oxo-2,3-dihydro-1H-naphthalene-2-carboxylic acid

2-[2-(2,5-dimethoxyphenyl)-2-oxoethyl]acrylic acid