NESS-0327 is a drug used in scientific research which acts as an extremely potent and selective antagonist of the cannabinoid receptorCB1. It is much more potent an antagonist, and more selective for the CB1 receptor over CB2, than the more commonly used ligand rimonabant, with a Ki at CB1 of 350fM (i.e. 0.00035nM) and a selectivity of over 60,000x for CB1 over CB2. Independently, two other groups have described only modest nanomolar CB1 affinity for this compound (125nM and 18.4nM). Also unlike rimonabant, NESS-0327 does not appear to act as an inverse agonist at higher doses, instead being a purely neutral antagonist which blocks the CB1 receptor but does not produce any physiological effect of its own.
^Ruiu, S; Pinna, GA; Marchese, G; Mussinu, JM; Saba, P; Tambaro, S; Casti, P; Vargiu, R; Pani, L (Jul 2003). "Synthesis and characterization of NESS 0327: a novel putative antagonist of the CB1 cannabinoid receptor". Journal of Pharmacology and Experimental Therapeutics. 306 (1): 363–70. doi:10.1124/jpet.103.049924. PMID12663689.
^Stoit, A.R.; Lange, J.H.M.; den Hartog, A.P.; Ronken, E.; Tipker, K.; van Stuivenberg, H.H.; Dijksman, J.A.R.; Wals, H.C.; Kruse, C.G. (2002). "Design, Synthesis and Biological Activity of Rigid Cannabinoid CB1 Receptor Antagonists". Chem. Pharm. Bull. 50 (8): 1109–1113. doi:10.1248/cpb.50.1109.
^Zhang, Y.; Burgess, J.P.; Brackeen, M.; Gilliam, A.; Mascarella, S.W.; Page, K.; Seltzman, H.H.; Thomas, B.F. (2008). "Conformationally Constrained Analogues of N -(Piperidinyl)-5-(4-Chlorophenyl)-1-(2,4- Dichlorophenyl)-4-Methyl-1 H -Pyrazole-3-Carboxamide (SR141716): Design, Synthesis, Computational Analysis, And Biological Evaluations". J. Med. Chem. 51 (12): 3526–3539. doi:10.1021/jm8000778.
^Tambaro, S; Mongeau, R; Dessi, C; Pani, L; Ruiu, S (Nov 2005). "Modulation of ATP-mediated contractions of the rat vas deferens through presynaptic cannabinoid receptors". European Journal of Pharmacology. 525 (1–3): 150–3. doi:10.1016/j.ejphar.2005.09.058. PMID16271359.