Trimethylamine is an organic compound with the formula N(CH3)3. It is a colorless gas or compressed liquid with a strong fishy odor, at low concentrations. At higher concentrations, the odor becomes more ammonia-like.

Dimethylamine is an organic compound with the formula (CH₃)₂NH. It is a colorless, flammable gas with an ammonia-like odor, although at low concentrations it can smell like fish, and its odor is more potent than methylamine and less than trimethylamine. Dimethylamine is commonly encountered commercially as a solution in water at concentrations up to around 40%.

Methylamine is the simplest primary amine, with the formula CH3NH2. It's a colorless gas that's derived from ammonia, with one hydrogen atom replaced by a methyl group. It was first synthesized in 1849 by Wurtz alongside dimethylamine and trimethylamine.

Choline [62-49-7], also known as trimethyl(2-hydroxyethyl)ammonium hydroxide, is a quaternary ammonium compound with the molecular formula C₅H₁₅O₂N. It was first isolated from pig bile in 1849 by Stecker and is subsequently found in brain tissue.

2-Chlorophenol, also known as ortho-chlorophenol, is an aromatic compound with the chemical formula C6H4ClOH. It is a liquid with a strong, unpleasant odor.

Propylene chlorohydrin is a general term that refers to the two isomers of chloropropanol (1-chloro-2-propanol and 2-chloro-l-propanol) with the chemical formula C3H7ClO. It is a colorless liquid with a pleasant odor, and it is soluble in water and organic solvents.

2-Chloroethanol, also known as ethylene chlorohydrin, is an organic chemical compound with the formula HOCH2CH2Cl. It is a colorless liquid with a pleasant odor that was an important intermediate used in the past to produce ethylene oxide, but that is no longer the case.