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Systematic (IUPAC) name
Clinical data
Legal status
CAS number 76-68-6
302-34-1 (sodium)
ATC code None
PubChem CID 6454
ChemSpider 6212 YesY
Synonyms Allylpental, Cyclopental, 5-Allyl-5-Δ2-Cyclopentenyl Barbituric Acid
Chemical data
Formula C12H14N2O3 
Mol. mass 234.251 g/mol
 YesY (what is this?)  (verify)

Cyclopentobarbital sodium (Cyclopal, Dormisan) is a barbiturate derivative invented in the 1940s.[1] It has sedative and anticonvulsant properties, and was used primarily as an anaesthetic in veterinary medicine.[2] Cyclopal is considered similar in effects to phenobarbital but lasts almost three times as long, and is considered a long-acting barbiturate with a fairly slow onset of action.

See also[edit]


  1. ^ Martin, J. R.; Godel, T.; Hunkeler, W.; Jenck, F.; Moreau, J.-L.; Sleight, A. J.; Widmer, U. (2000). Psychopharmacological Agents. doi:10.1002/0471238961.1619250313011820.a01. 
  2. ^ Vander Brook MJ, Cartland GF. A Pharmacologic Study of 5-Allyl-5-Cyclopentenyl Barbituric Acid (Cyclopal). Journal of Pharmacology And Experimental Therapeutics, 1944, 80(2): 119-125