Salvinorin A (1), a neoclerodane diterpenoid, isolated from the Mexican hallucinogenic plant Salvia divinorum, 1 is a selective κ-opioid receptor (KOR) agonist. 2 Its hallucinogenic activity is the most potent among any other known non-nitrogenous and nitrogenous compounds such as tetrahydrocannabinol (THC) or lysergic acid diethylamide (LSD), respectively. 1b,3 Since a different mechanism from LSD or mescaline is anticipated for its activity, salvinorin A (1) ...