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Systematic (IUPAC) name
Clinical data
Legal status
CAS number 226954-04-7
ATC code None
PubChem CID 6433109
UNII OG837L732J YesY
Chemical data
Formula C23H23N5O2 
Mol. mass 401.461 g/mol
 YesY (what is this?)  (verify)

Emapunil (AC-5216, XBD-173) is an anxiolytic drug which acts as a selective agonist at the peripheral benzodiazepine receptor, also known as the mitochondrial 18 kDa translocator protein or TSPO.[1][2] This protein has multiple functions, among which is regulation of steroidogenesis,[3][4] particularly the production of neuroactive steroids such as allopregnanolone in the brain.[5][6][7] In both animal and human trials, emapunil produced fast acting anxiolytic and anti-panic effects, without producing sedation or withdrawal symptoms following cessation of use.[8][9] Emapunil is also used in its 11C radiolabelled form to map the distribution of TSPO receptors in the brain.[10][11]


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  3. ^ Veenman L, Papadopoulos V, Gavish M (2007). "Channel-like functions of the 18-kDa translocator protein (TSPO): regulation of apoptosis and steroidogenesis as part of the host-defense response". Current Pharmaceutical Design 13 (23): 2385–405. doi:10.2174/138161207781368710. PMID 17692008. 
  4. ^ Falchi AM, Battetta B, Sanna F, Piludu M, Sogos V, Serra M, Melis M, Putzolu M, Diaz G (August 2007). "Intracellular cholesterol changes induced by translocator protein (18 kDa) TSPO/PBR ligands". Neuropharmacology 53 (2): 318–29. doi:10.1016/j.neuropharm.2007.05.016. PMID 17631921. 
  5. ^ Kita A, Furukawa K (April 2008). "Involvement of neurosteroids in the anxiolytic-like effects of AC-5216 in mice". Pharmacology, Biochemistry, and Behavior 89 (2): 171–8. doi:10.1016/j.pbb.2007.12.006. PMID 18201755. 
  6. ^ Da Settimo F, Simorini F, Taliani S, La Motta C, Marini AM, Salerno S, Bellandi M, Novellino E, Greco G, Cosimelli B, Da Pozzo E, Costa B, Simola N, Morelli M, Martini C (September 2008). "Anxiolytic-like effects of N,N-dialkyl-2-phenylindol-3-ylglyoxylamides by modulation of translocator protein promoting neurosteroid biosynthesis". Journal of Medicinal Chemistry 51 (18): 5798–806. doi:10.1021/jm8003224. PMID 18729350. 
  7. ^ Taliani S, Da Settimo F, Da Pozzo E, Chelli B, Martini C (September 2009). "Translocator Protein Ligands as Promising Therapeutic Tools for Anxiety Disorders". Current Medicinal Chemistry 16 (26): 3359–80. doi:10.2174/092986709789057653. PMID 19548867. 
  8. ^ Rupprecht R, Rammes G, Eser D, Baghai TC, Schüle C, Nothdurfter C, Troxler T, Gentsch C, Kalkman HO, Chaperon F, Uzunov V, McAllister KH, Bertaina-Anglade V, La Rochelle CD, Tuerck D, Floesser A, Kiese B, Schumacher M, Landgraf R, Holsboer F, Kucher K (June 2009). "Translocator Protein (18 kD) as Target for Anxiolytics Without Benzodiazepine-Like Side Effects". Science 325 (5939): 490–3. doi:10.1126/science.1175055. PMID 19541954. 
  9. ^ Kita A, Kinoshita T, Kohayakawa H, Furukawa K (June 2009). "Lack of tolerance to anxiolysis and withdrawal symptoms in mice repeatedly treated with AC-5216, a selective TSPO ligand". Progress in Neuro-psychopharmacology & Biological Psychiatry 33 (6): 1040–5. doi:10.1016/j.pnpbp.2009.05.018. PMID 19497344. 
  10. ^ Zhang MR, Kumata K, Maeda J, Yanamoto K, Hatori A, Okada M, Higuchi M, Obayashi S, Suhara T, Suzuki K (November 2007). "11C-AC-5216: a novel PET ligand for peripheral benzodiazepine receptors in the primate brain". Journal of Nuclear Medicine 48 (11): 1853–61. doi:10.2967/jnumed.107.043505. PMID 17978354. 
  11. ^ Miyoshi M, Ito H, Arakawa R, Takahashi H, Takano H, Higuchi M, Okumura M, Otsuka T, Kodaka F, Sekine M, Sasaki T, Fujie S, Seki C, Maeda J, Nakao R, Zhang MR, Fukumura T, Matsumoto M, Suhara T (June 2009). "Quantitative Analysis of Peripheral Benzodiazepine Receptor in the Human Brain Using PET with 11C-AC-5216". Journal of Nuclear Medicine 50 (7): 1095–101. doi:10.2967/jnumed.109.062554. PMID 19525461.