More examples CH CH,CH,-COOH Butyric acid（酪酸)：(from Latin butyrum:butter):gives rancid butter its characteristic smell. OH Lactic acid（乳酸)：(from CH CH-COOH Latin lactim:milk):gives sour milk its characteristic taste. CH3(CH2)16-COOH Stearic acid(硬脂酸)：one of the main components of animal fat (saturated fat). OH Citric acid(柠檬酸)gives its characteristic flavor to lemons and HOOC-CH,-C-CH,COOH other citric fruits.Used widely as preservative (antioxidant)and as an COOH additive for tartness.More examples Butyric acid（酪酸）: (from Latin butyrum: butter): gives rancid butter its characteristic smell. Lactic acid （乳酸） : (from Latin lactim: milk): gives sour milk its characteristic taste. Stearic acid（硬脂酸）: one of the main components of animal fat (saturated fat). Citric acid（柠檬酸） gives its characteristic flavor to lemons and other citric fruits. Used widely as preservative (antioxidant) and as an additive for tartness