Isoamyl alcohol is a colorless liquid with the formula C5H12O, specifically (H3C–)2CH–CH2–CH2–OH. It is one of several isomers of amyl alcohol (pentanol). It is also known as isopentyl alcohol, isopentanol, or (in the IUPAC recommended nomenclature) 3-methyl-butan-1-ol. An obsolete name for it was isobutyl carbinol.Iso-Amyl Alcohol 99% AR is a high-purity grade of isoamyl alcohol with a minimum purity of 99%, specifically a reagent grade (“AR”) used in chemical and biological laboratories for demanding applications requiring high purity and consistency. It is a clear, colorless liquid with the chemical formula C₅H₁₂O and is used as a solvent, an ingredient in flavorings, and as a reagent in various laboratory procedures.Isoamyl alcohol is an ingredient in the production of banana oil, an ester found in nature and also produced as a flavouring in industry. It is a common fusel alcohol, produced as a major by-product of ethanol fermentation.