<unk>  (as known in the US), or hexobarbitone (as known elsewhere), sold both in acid and sodium salt forms as Citopan, Evipan, and Tobinal (usually in 250-mgm. strength tablets), is a barbiturate derivative having hypnotic and sedative effects. It was used in the 1940s-1950s as an agent for inducing anesthesia for surgery, as well as a rapid-acting, short-lasting hypnotic for general use, and has a relatively fast onset of effects and short duration of action. However it can be difficult to control the depth of anesthesia with<unk>  which makes it quite dangerous, and it has now been replaced by safer drugs in human medicine; usually thiopental would be the barbiturate of choice for this application these days.<unk>  is still used in some scientific research.
Hexobarbital
Pentobarbital
Allobarbital
Ethallobarbital
Amobarbital sodium
Secobarbital sodium
Chloral hydrate
Methylene Dianiline