4,4-bis(4-methoxyphenyl)but-3-enoic acid

3-(4-甲氧基苯甲酰基)丙酸

1,6,11,16-tetraoxacycloicosane-2,5,12,15-tetrone

5,5-diethyloxolan-2-one

5-ethoxy-5-ethyl-dihydro-furan-2-one