1-Butyl-3-(1-naphthoyl)indole, the N-butyl homolog of JWH-018; Ki ~8.9 nM at CB1 with roughly 3x CB1-over-CB2 selectivity. Year given is the 1998 JPET publication of the desmethyl naphthoylindole series rather than a documented bench date — JWH numbers are sequential lab-notebook codes, so synthesis preceded publication. Detected by University of Freiburg researchers on 20 April 2009 in a product sold as 'Forest Humus', and it spread through Spice-type blends after JWH-018 was banned in Germany.