The chemical formula 2CH3COO represents two molecules of acetate, which is the anion of acetic acid (CH3COOH). It is commonly found in the form of a salt, such as sodium acetate (CH3COONa) or potassium acetate (CH3COOK). Acetate salts are often used as food additives, preservatives, or as starting materials in various chemical reactions. They are also found naturally in many fruits, vegetables, and fermented foods.