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JWH 018 is a mildly selective agonist of the peripheral cannabinoid (CB2) receptor, derived from the aminoalkylindole WIN 55,212-2. The Ki values for binding central cannabinoid (CB1) and CB2 receptors are 9.0 and 2.94 nM, respectively, for a CB1:CB2 ratio of 3.06.1 Its effects on suppression of spontaneous activity, maximum possible antinociceptive effect in the tail-flick assay, and rectal temperature are comparable to those of WIN 55,212-2 when tested in rats.
It is a research chemical that belongs to the naphthoylindole family. JWH-081 as all the other research chemicals in the JWH group is a synthetic cannabinoid with analgesic effects.Its full chemical name is 4-methoxynaphthalen- 1-yl- (1-pentylindol- 3-yl)methanone with chemical formula as C25H25NO2 and molecular mass 371.47 g/mol.
John W. Huffman, an organic chemist at Clemson University, synthesized a variety of chemical compounds that affect the endocannabinoid system. JWH-018 is one of these compounds, with studies showing an affinity for the cannabinoid (CB1) receptor five times greater than that of THC. Cannabinoid receptors are found in mammalian brain and spleen tissue; however, the structural details of the active sites are currently unknown.
On December 15, 2008, it was reported by German pharmaceutical companies that JWH-018 was found as one of the active components in at least three versions of the grey market drug Spice, which has been sold as an incense in a number of countries around the world since 2002. An analysis of samples acquired four weeks after the German prohibition of JWH-018 took place found that the manufacturers had shortened the alkyl chain by one carbon to circumvent the ban.[