<chemical> A sedative and hypnotic that has been used in the short-term management of insomnia. Its use has been superseded by other drugs. ... Pharmacological action: sedatives, nonbarbiturate. ... Chemical name: 1-Penten-4-yn-3-ol, 1-chloro-3-ethyl- ... (12 Dec 1998) ... Found on http://www.encyclo.co.uk/local/20973