Varenicline Impurity 17

2,2,2-Trifluoro-1-(1,2,4,5-tetrahydro-6,8-dinitro-1,5-methano-3H-3-benzazepin-3-yl) ethanone is used in the preparation of Varenicline, an a4beta2 nicotinic receptor partial agonist for smoking cessation.