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Systematic (IUPAC) name
5-benzyl- 5-butyl- 1,3-diazinane- 2,4,6-trione
CAS Number 66941-94-4
ATC code none
PubChem CID 48575
Synonyms Benzylbutylbarbiturate
Chemical data
Formula C15H18N2O3
Molar mass 274.314 g/mol[[Script error: No such module "String".]]
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Benzylbutylbarbiturate (5-benzyl- 5-(n)-butylbarbituric acid) is a rare example of a barbiturate designer drug, possibly the only such compound encountered in recent years. It was confiscated by police in Japan in 2000, and presumably was a product of clandestine manufacture as this compound has never previously been sold as a legal pharmaceutical (although it was known from the scientific literature and so was not a new chemical entity).[1] As with all designer drugs, this compound was produced in an attempt to circumvent drug laws prohibiting the use of most known barbiturate drugs, however as the drug laws in many jurisdictions (including Japan) prohibit "any 5,5-disubstituted derivative of barbituric acid", this compound was deemed to be already illegal, despite being a novel compound which had not previously been encountered.[2]


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  1. Alles GA, Ellis CH, Feigen GA, Redemann MA. Comparative Central Depressant Actions of some 5-Phenyl-5-Alkyl Barbituric Acids. Journal of Pharmacology and Experimental Therapeutics. 1947 Mar;89(3):356-367.
  2. Ohta H, Suzuki Y, Sugita R, Suzuki S, Ogasawara K. Confiscation Case Involving a Novel Barbiturate Designer Drug. Canadian Society of Forensic Science Journal. 2000 Sep;33(3):103-110.