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You are here Home Controlled substances List of controlled substances Barbiturates belonging to the class of 5,5-disubstituted barbituric and thiobarbituric acids Listen Print Share LinkedIn (Twitter) Facebook Email Loading... Description including compounds structurally derived from those acids, but not limited to: Additional substances hexobarbital; thiobutalbarbital; (sodium) thiopental; methohexital; Application type Narcotic Import licence required Yes Import permit required Yes Export licence and permit required Yes Find information on Licences and permits Back to controlled substances list