Acetylsalicylic Anhydride; 2-(Acetyloxy)benzoic Anhydride; Salicylic Acid Acetate Anhydride; 2-Acetoxybenzoic Anhydride;Contraflu; Pircan; Vigal; 2-(Acetyloxy)benzoic Acid 1,1'-Anhydride; Aspirin impurity F; Aspirin anhydride (USP); 2-(Acetyloxy)benzoic Acid 1,1’-Anhydride; Aspirin anhydride; Contraflu; Pircan; Vigal; Acetylsalicylic Acid Impurity D