3-(1-hydroxy-2-phenylethylidene)oxolane-2,4-dione

3-(1-hydroxyhexylidene)oxolane-2,4-dione

3-(2-methylphenyl)-2H-furan-5-one

3-溴-4-羟基-2(5H)-呋喃酮

4-苯胺基呋喃-2(5H)-酮