Propionic anhydride, min. 98,5 %, for synthesis, Molar mass (M) 130,14 g/mol, Density (D) 1,01 g/cm³, Flash point (flp) 63 °C, Boiling point (bp) 168 °C, CAS No. [123-62-6], UN-Nr. 2496, EG-Nr. 204-638-2, Empirical formula C6H10O3