dimethyl 2,6-dichloro-3,5-difluoroterephthalate

2,3,5,6-tetrafluorobenzene-1,4-dicarbonyl fluoride

2-chloro-3,5,6-trifluoroterephthaloyl difluoride

dibutyl 2,3,5,6-tetrachlorobenzene-1,4-dicarboxylate