 Dimethyldioctadecylammonium bromide

Dimethyldioctadecylammonium bromide (also known as DODAB) is a quaternary ammonium compound that is used as a surfactant and a cationic lipid. It is characterized by having two long-chain octadecyl (C18) hydrocarbon tails and two methyl groups attached to a nitrogen atom, making it hydrophobic and lipophilic. The bromide ion serves as the counter ion in this compound.