Benzodiazepine

Patent Pending Benzodiazepines /ˌbɛnzɵdaɪˈæzɨpiːn/ (sometimes colloquially "benzos"; often abbreviated "BZD") are a class of psychoactive drugs whose core chemical structure is the fusion of a benzene ring and a diazepine ring. The first such drug, chlordiazepoxide (Librium), was discovered accidentally by Leo Sternbach in 1955, and made available in 1960 by Hoffmann–La Roche - which, since 1963, has also marketed the benzodiazepine diazepam (Valium).