Wiktionary
butobarbital
n. A hypnotic barbiturate drug.
Wikipedia
Butobarbital
Butobarbital ( BAN), also called butobarbitone or butethal, Soneryl, and Neonal, is a hypnotic drug which is a barbiturate derivative. It was developed by Poulenc Brothers (now part of Rhône Poulenc) in 1921.