1-Pentyl-3-(4-ethyl-1-naphthoyl)indole and the most CB1-potent of the 4-substituted naphthoyl derivatives (Ki 0.46 nM CB1, 0.69 nM CB2) — higher affinity than the 4-methyl (JWH-122), 4-n-propyl (JWH-182) and 4-methoxy (JWH-081) analogues. From the 2005 Huffman naphthoylindole SAR paper; banned in Sweden 1 October 2010 alongside JWH-122.