JWH-250 or (1-pentyl-3-(2-methoxyphenylacetyl)indole) is an analgesic chemical from the phenylacetylindole family that acts as a cannabinoidagonist at both the CB1 and CB2 receptors, with a Ki of 11nM at CB1 and 33nM at CB2. Unlike many of the older JWH series compounds, this compound does not have a naphthalene ring, instead occupying this position with a 2'-methoxy-phenylacetyl group, making JWH-250 a representative member of a new class of cannabinoid ligands. Other 2'-substituted analogues such as the methyl, chloro and bromo compounds are also active and somewhat more potent.
JWH-250 was discovered by, and named after the researcher Dr. John W. Huffman. He created JWH-250 and a number of other compounds to research the structure and function of the endocannabinoid system of mammals. Samples of JWH-250 were first identified in May 2009 by the German Federal Criminal Police, as an ingredient in new generation "herbal smoking blends" that had been released since the banning of the original ingredients (C8)-CP 47,497 and JWH-018. An ELISA immunoassay technique for detecting JWH-250 in urine has been reported.