Butobarbital, also called butobarbitone or butethal, Soneryl, and Neonal,[1] is a hypnotic drug which is a barbiturate derivative.[2] It was developed by Poulenc Brothers (now part of Sanofi) in 1921.[3]
^Nordegren T (2002). "Butobarbital". The A-Z encyclopedia of alcohol and drug abuse. Parkland, Fla.: Brown Walker Press. p. 144. ISBN978-1-58112-404-0.
^DE 481129, "Verfahren zur Herstellung von n-Butylaethylbarbitursaeure", published 3 February 1922, issued 14 August 1929, assigned to ETS Poulenc Freres.