1-Pentyl-3-(4-methoxy-1-naphthoyl)indole; Ki 1.2 nM at CB1 vs 12.4 nM at CB2, about tenfold CB1-selective. Sources disagree on which paper introduced it — the Wikipedia Ki table cites Aung et al. (Drug Alcohol Depend. 2000) while the article body cites Huffman et al. (Bioorg. Med. Chem. 2003 and 2005). The 2005 paper is the one whose stated scope covers 4-methoxy naphthoyl substituents, so that year is used here.