C4H6O3 is the chemical formula for a compound known as butyric acid. It is a colorless liquid with a strong, unpleasant odor, often associated with rancid butter. Butyric acid is a short-chain fatty acid that occurs naturally in various animal fats and plant oils. It plays a role in the metabolism of fats and is important for gut health. This compound is also used in the production of various esters, which are often used in the food and fragrance industries for flavoring and scent. Additionally, butyric acid is studied for its potential health benefits, including its role in promoting gut health and its anti-inflammatory properties.