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  2. C4-FN - Wikipedia

    en.wikipedia.org/wiki/C4-FN

    C4-FN (C4-fluoronitrile, C4FN) is a perfluorinated compound developed as a high-dielectric gas for high-voltage switchgear. [1] It has the structure (CF 3) 2 CFC≡N, which can be described as perfluoroisobutyronitrile, falling under the category of PFAS, or per- and polyfluoroalkyl substances.