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Patentanmeldung WO2012105586A1: Perfluorobutane sulfonyl fluoride, potassium perfluorobutane sulfonate salt, and method for producing perfluorobutane sulfonyl fluoride. Angemeldet am 1. Februar 2012, veröffentlicht am 9. August 2012, Anmelder: Mitsubishi Materials Corp et al, Erfinder: Hiroyuki Yatsuyanagi et al.