abstract |
Salts and crystalline forms of several salts of Varenicline, i.e., Varenicline sulfate, Varenicline mesylate, and Varenicline fumarate, methods of preparing the solid states of Varenicline sulfate, Varenicline mesylate, and Varenicline fumarate, and processes for preparing Varenicline base from those Varenicline salts are provided. |