4-(1-Ethyldecyl)benzenesulfonic Acid Sodium Salt is an anionic surfactants. Also, it is derived from Decanal (D212505), which is an aliphatic reagent used in the preparation of a new class of antibacterials resulting from erythromycin derivatives. It is used in the preparation of 2,4-disubstituted pyrrolidines from aldehydes.