4,4'-OXYDI-2-BUTANOL, or 2-Butanol, is a chiral organic compound that can be obtained as either of two stereoisomers designated as (R)-(−)-2-butanol and (S)-(+)-2-butanol. This compound is a secondary alcohol used as a solvent, primarily as the precursor to methyl ethyl ketone, used in household cleaning agents. The volatile esters of 2-Butanol are also used in perfumes and artificial flavorings. It is known to cause moderate skin, eye and respiratory tract irritation with prolonged exposure.