 The scent of 1-butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion.The threshold level for 1-butanethiol is reported as 1.4 ppb

1-Butanethiol is chemically classified among the thiols, which are organic compounds with molecular formulas and structural formulas similar to alcohols, except that sulfur-containing sulfhydryl group (-SH) replaces the oxygen-containing hydroxyl group (-OH) in the molecule.1-Butanethiol's basic molecular formula is C4H9SH, and its structural formula is similar to that of the alcohol "n"-butanol.