<unk> , also known as trichloroacetaldehyde monohydrate, 2,2,2-trichloro-1,1-ethanediol, and under the tradenames Aquachloral, Novo-Chlorhydrate, Somnos, Noctec, and Somnote, is a sedative and hypnotic drug as well as a<unk> emical reagent and precursor. Its<unk> emical formula is C2H3Cl3O2.
It was discovered through the<unk> lorination of ethanol in 1832 by Justus von Liebig in Gießen. It was widely abused and misprescribed in the late 19th century.<unk>  is soluble in both water and alcohol, readily forming concentrated solutions.  A solution of<unk>  in alcohol called "knockout drops" was used to prepare a Mickey Finn.
It is a minor side-product of the<unk> lorination of water, concentrations rarely exceeding 5 micrograms per litre (µg/l).
Chloral hydrate
Amobarbital sodium
Pentobarbital
Ethallobarbital
Allobarbital
Galantamine hydrobromide
Hexobarbital
Secobarbital sodium