The chemical Varenicline has a known molecular formula of C13-H13-N3. Synonyms may include: CP 526555, 7,8,9,10-Tetrahydro-6,10-methano-6H-pyrazino(2,3-h)(3)benzazepine, HSDB 7591, UNII-W6HS99O8ZO (ChemID). Varenicline has been assigned a MeSH pharmacological action of: Nicotinic Agonist.