5,6,7,8-Tetrafluoro-2-ethoxycarbonyl-4H-chromen-2-one

pentafluorobenzoylpyruvic acid

2-amino-3-(2-hydroxy-3,4,5,6-tetrafluorobenzoyl)acrylic acid

3-(3,4,5,6-tetrafluoro-2-hydroxybenzoylmethylene)piperazin-2-one

ethyl pentafluorobenzoylpyruvate