A naphthoylpyrrole from Huffman, Padgett, Isherwood, Wiley and Martin, '1-Alkyl-2-aryl-4-(1-naphthoyl)pyrroles: new high affinity ligands for the cannabinoid CB1 and CB2 receptors' (Bioorg. Med. Chem. Lett. 16:5432–5435, 2006). Ki 11 nM CB1, 7.1 nM CB2. Banned in Sweden on 1 October 2010 after appearing in synthetic cannabis products.