1,2,4,5-Tetrachlorobenzene-13C6 is an intermediate used in the synthesis of 2,4,5-Trichlorophenol-13C6 (T774148), which is an isotope labelled 2,4,5-Trichlorophenol is used as a broad range pesticide against insects, fungi, vegetation and bacteria. It has become a common environmental contaminant and probable human carcinogen.