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Chemical formula: C₈H₁₆O₂
CAS：109-21-7 is an organic compound formed by the condensation reaction of butyric acid and n-butanol.

Physical and chemical properties:
- Appearance and properties: colorless transparent liquid.
- Melting point: -91.5℃.
- Boiling point: 166.6℃.
- Relative density: 0.868-0.874 (water =1).

Purpose:
- Fragrance field: It is allowed to be used in our country, which is often used to prepare banana, pineapple, apple and other fruit flavor and whiskey flavor, can also be used for the aroma of cream flavor, can also be used for tobacco, soap flavor and cosmetics flavor, such as lip balm flavor.
- Solvent: It can be used as a solvent in nitrocellulose, shellac, coumarone resin and coatings.
- Analytical detection: can be used as a standard material for chromatographic analysis.
- Organic synthesis: intermediates used to synthesize other organic compounds.