Ethyl 2,3,4,5-tetrafluorobenzoylacetate2,3,4,5-tetrafluoro-β-oxobenzenepropanoic Acid Ethyl EsterEthyl α-(2,3,4,5-Tetrafluorobenzoyl)acetate2,3,4,5-Tetrafluorobenzoylacetic Acid Ethyl EsterEthyl 2,3,4,5-Tetrafluoro-β-oxobenzenepropanoateEthyl 2,3,4,5-tetrafluoro-β-oxobenzenepropionateEthyl 2,3,4,5-TetrafluorobenzoylacetateEthyl 2-(2,3,4,5-Tetrafluorobenzoyl)acetate