2,3,4,5-Tetrahydro-1,5-methano-1H-3-benzazepine
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2,3,4,5-Tetrahydro-1,5-methano-1H-3-benzazepine is a drug originally researched as a potential opioid analgesic, but was found to be inactive in this assay, and relatively toxic to mice.[1] Subsequently it was found to possess activity as an agonist at nicotinic acetylcholine receptors during the course of work that ultimately led to the discovery of the anti-smoking drug varenicline.[2][3]
More recently this chemical compound is claimed to have been sold as a designer drug under the name A3A,[citation needed] but since the anecdotally reported effects of the product sold under this name do not seem to bear any resemblance to the known pharmacology of genuine 2,3,4,5-tetrahydro-1,5-methano-1H-3-benzazepine, it seems unlikely that this is actually the compound being sold.