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Article Id: WHEBN0028908987
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Title: Fasiplon  
Author: World Heritage Encyclopedia
Language: English
Subject: Nonbenzodiazepine, Imidazopyridine, CP-615,003, Heptobarbital, Nealbarbital
Collection: Gabaa Receptor Positive Allosteric Modulators, Imidazopyrimidines, Oxadiazoles, Sedatives
Publisher: World Heritage Encyclopedia


Systematic (IUPAC) name
Clinical data
Legal status
CAS number  YesY
ATC code None
ChemSpider  N
Chemical data
Formula C13H15N5O2 
Mol. mass 273.290 g/mol

Fasiplon (RU 33203) is a nonbenzodiazepine anxiolytic drug from the imidazopyrimidine family of drugs.

Fasiplon binds strongly to benzodiazepine sites on the GABAA receptor and has similar anxiolytic effects in animals, but with less sedative or muscle relaxant action.[1] It was developed by a team at Roussel Uclaf in the 1990s[2]


  1. ^ Tully WR, Gardner CR, Gillespie RJ, Westwood R (July 1991). "2-(oxadiazolyl)- and 2-(thiazolyl)imidazo[1,2-a]pyrimidines as agonists and inverse agonists at benzodiazepine receptors". Journal of Medicinal Chemistry 34 (7): 2060–7.  
  2. ^ US Patent 5869481 Anticonvulsive 1-ar(alk)ylimidazolin-2-ones and process for making
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