1-Propyl-2-methyl-3-(1-naphthoyl)indole, from Huffman, Dai, Martin and Compton, 'Design, synthesis and pharmacology of cannabimimetic indoles' (Bioorg. Med. Chem. Lett. 4:563–566, 1994) — the paper that started the indole series by replacing WIN 55,212-2's aminoalkyl group with a plain alkyl chain. Ki 164 nM CB1 vs 13.8 nM CB2; one of the first compounds with genuinely useful CB2 selectivity, and still a standard laboratory CB2 agonist.