Cannabis Ruderalis

PipISB Structure.svg
  • N-(4-fluorobenzyl)-4-(3-(piperidin-1-ylindole-1-sulfonyl)benzamide
PubChem CID
Chemical and physical data
Molar mass491.58 g·mol−1
3D model (JSmol)
  • O=S(N1C2=CC=CC=C2C(N3CCCCC3)=C1)(C4=CC=C(C(NCC5=CC=C(F)C=C5)=O)C=C4)=O

PipISB is a drug used in scientific research which acts as a potent and selective inverse agonist of the cannabinoid receptor CB1. It is highly selective for the CB1 receptor over CB2, with a Kd at CB1 of 1.5nM vs over 7000nM at CB2, has good blood-brain barrier penetration, and can be conveniently radiolabelled with either 11C or 18F, making it useful for mapping the distribution of CB1 receptors in the brain.[1][2]


  1. ^ Donohue SR, Halldin C, Schou M, Hong J, Phebus L, Chernet E, et al. (2008). "Radiolabeling of a high potency cannabinoid subtype-1 receptor inverse agonist, N-(4-fluoro-benzyl)-4-(3-(piperidin-1-yl-indole-1-sulfonyl)benzamide (PipISB), with carbon-11 or fluorine-18". Journal of Labelled Compounds and Radiopharmaceuticals. 51 (3): 146. doi:10.1002/jlcr.1491.
  2. ^ Finnema SJ, Donohue SR, Zoghbi SS, Brown AK, Gulyás B, Innis RB, et al. (January 2009). "Evaluation of [11C]PipISB and [18F]PipISB in monkey as candidate radioligands for imaging brain cannabinoid type-1 receptors in vivo". Synapse. 63 (1): 22–30. doi:10.1002/syn.20578. PMC 2587077. PMID 18925657.

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