Heptafluorobutyric acid anhydride, min. 97 %, for GC, Molar mass (M) 410,06 g/mol, Density (D) 1,653 g/cm³, Boiling point (bp) 108 to 109 °C, CAS No. [336-59-4], UN-Nr. 3265, EG-Nr. 206-410-8, Empirical formula C8F14O3