(1-Pentylindol-3-yl)naphthalen-1-ylmethane — JWH-018 with the ketone replaced by a plain methylene bridge, Ki 22 nM at CB1, several times weaker than JWH-018. From Huffman, Mabon, Wu et al., '3-Indolyl-1-naphthylmethanes' (Bioorg. Med. Chem. 11:539–549, 2003), which argued for aromatic stacking rather than hydrogen bonding at CB1. The abstract uses numbered compounds rather than JWH codes, so the code-to-paper mapping comes from the Huffman-series list.