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SB-699,551 structure.png
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass511.739 g/mol g·mol−1
3D model (JSmol)

SB-699551 is a drug which was the first compound developed to act as a selective antagonist for the serotonin receptor 5-HT5A, with selectivity of around 100x over other serotonin receptor subtypes.[1] Multiple therapeutic roles have been suggested for 5-HT5A ligands due to the presence of this receptor in several areas of the brain, but research is still at an early stage,[2] In animal studies, SB-699551 was found to block cue-mediated responding to LSD, again suggesting an antipsychotic type of activity.[3]


  1. ^ Thomas DR, Soffin EM, Roberts C, Kew JN, de la Flor RM, Dawson LA, et al. (September 2006). "SB-699551-A (3-cyclopentyl-N-[2-(dimethylamino)ethyl]-N-[(4'-{[(2-phenylethyl)amino]methyl}-4-biphenylyl)methyl]propanamide dihydrochloride), a novel 5-ht5A receptor-selective antagonist, enhances 5-HT neuronal function: Evidence for an autoreceptor role for the 5-ht5A receptor in guinea pig brain". Neuropharmacology. 51 (3): 566–77. doi:10.1016/j.neuropharm.2006.04.019. PMID 16846620.
  2. ^ Nikiforuk A, Hołuj M, Kos T, Popik P (June 2016). "The effects of a 5-HT5A receptor antagonist in a ketamine-based rat model of cognitive dysfunction and the negative symptoms of schizophrenia". Neuropharmacology. 105: 351–360. doi:10.1016/j.neuropharm.2016.01.035. PMID 26826431.
  3. ^ Popik P, Krawczyk M, Kuziak A, Bugno R, Hogendorf A, Staroń J, Nikiforuk A (August 2019). "Serotonin type 5A receptor antagonists inhibit D-lysergic acid diethylamide discriminatory cue in rats". Journal of Psychopharmacology: 269881119867603. doi:10.1177/0269881119867603. PMID 31452444.