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CAS Number
  • 155928-24-8 ☒N
PubChem CID
  • 132997
  • 117371 ☑Y
  • T0W602CN0W
CompTox Dashboard (EPA)
  • DTXSID90165995
Chemical and physical data
Formula C23H29FIN3O2
Molar mass 525.398 g·mol−1
3D model (JSmol)
  • Interactive image
 ☒N☑Y (what is this?)   (verify)

5-I-R91150 (or R93274) is a compound that acts as a potent and selective antagonist of 5-HT2A receptors.[1] Its main application is as its iodine-123 radiolabeled form, in which it can be used in SPECT scanning[2] in human neuroimaging studies, to examine the distribution of the 5-HT2A receptor subtype in the brain, e.g. with respect to sex and age[3] and in adults with Asperger syndrome[4] or Alzheimer's disease.[5]

An alternative 5-HT2A receptor ligand also used in neuroimaging is altanserin.


  1. ^ Peremans K, Audenaert K, Coopman F, Jacobs F, Dumont F, Slegers G, et al. (2003). "Regional binding index of the radiolabeled selective 5-HT2A antagonist 123I-5-I-R91150 in the normal canine brain imaged with single photon emission computed tomography". Veterinary Radiology & Ultrasound. 44 (3): 344–51. doi:10.1111/j.1740-8261.2003.tb00467.x. PMID 12816380.
  2. ^ Busatto GF, Pilowsky LS, Costa DC, Mertens J, Terriere D, Ell PJ, et al. (February 1997). "Initial evaluation of 123I-5-I-R91150, a selective 5-HT2A ligand for single-photon emission tomography, in healthy human subjects". European Journal of Nuclear Medicine. 24 (2): 119–24. doi:10.1007/BF02439542. PMID 9021107.
  3. ^ Baeken C, D'haenen H, Flamen P, Mertens J, Terriere D, Chavatte K, et al. (December 1998). "123I-5-I-R91150, a new single-photon emission tomography ligand for 5-HT2A receptors: influence of age and gender in healthy subjects". European Journal of Nuclear Medicine. 25 (12): 1617–22. doi:10.1007/s002590050339. PMID 9871092.
  4. ^ Murphy DG, Daly E, Schmitz N, Toal F, Murphy K, Curran S, et al. (May 2006). "Cortical serotonin 5-HT2A receptor binding and social communication in adults with Asperger's syndrome: an in vivo SPECT study". The American Journal of Psychiatry. 163 (5): 934–6. doi:10.1176/appi.ajp.163.5.934. PMID 16648340.
  5. ^ Versijpt J, Van Laere KJ, Dumont F, Decoo D, Vandecapelle M, Santens P, et al. (2003). "Imaging of the 5-HT2A system: age-, gender-, and Alzheimer's disease-related findings". Neurobiology of Aging. 24 (4): 553–61. doi:10.1016/S0197-4580(02)00137-9. PMID 12714112.

Further reading

  • Catafau AM, Danus M, Bullich S, Llop J, Perich J, Cunningham VJ, et al. (June 2006). "Characterization of the SPECT 5-HT2A receptor ligand 123I-R91150 in healthy volunteers: Part 1--pseudoequilibrium interval and quantification methods". Journal of Nuclear Medicine. 47 (6): 919–28. PMID 16741300.
  • Catafau AM, Danus M, Bullich S, Nucci G, Llop J, Abanades S, et al. (June 2006). "Characterization of the SPECT 5-HT2A receptor ligand 123I-R91150 in healthy volunteers: part 2--ketanserin displacement". Journal of Nuclear Medicine. 47 (6): 929–37. PMID 16741301.
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