The present invention provides crystalline Moxonidine salts e.g., mono-Moxonidine oxalate and mono-Moxonidine formate. Also provided by the present invention is a novel purification process of Moxonidine using these crystalline Moxonidine salts. By precipitating a Moxonidine salt from the reaction mixture and reacting it with a base, highly pure crystalline Moxonidine base is obtained in high yield.
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