has role is protonated form of acetic acid HOAc E 260 E260 ACETIC ACID Methanecarboxylic acid CHEBI:2387 AcOH acetic acid Ethylic acid acide acetique CH3-COOH Ethanoic acid CHEBI:22169 ethoic acid ACETIC ACID MeCO2H MeCOOH Acetic acid E-260 CH3CO2H Acetic acid CHEBI:40486 A simple monocarboxylic acid containing two carbons. acetic acid Essigsaeure INS No. 260 monocarboxylic acid acetate protic solvent food acidity regulator antimicrobial food preservative Daphnia magna metabolite