hexobarbital
noun
hexo·bar·bi·tal
ˌhek-sə-ˈbär-bə-ˌtȯl
: a barbiturate C12H16N2O3 used as a sedative and hypnotic and in the form of its soluble sodium salt as an intravenous anesthetic of short duration
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Merriam-Webster unabridged
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