Methods of synthesis and/or purification of diaminophenothiazinium compounds
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United States of America Patent
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Jun 13, 2017
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app pub date -
Jun 17, 2016
filing date -
Jul 11, 2006
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Abstract
Disclosed are methods of synthesis and/or purification of certain 3,7-diamino-phenothiazin-5-ium compounds (“diaminophenothiazinium compounds”) including Methylthioninium Chloride (MTC) (Methylene Blue), and the resulting high purity characterized by a purity greater than 98%, and very low levels of heavy metals and organic impurities Azure A, B, C and MVB. Also disclosed are methods of treatment of a tauopathy or methemoglobinemia in a patient in need thereof, comprising administering to the patient a therapeutically effective amount of the high-purity diaminophenothiazinium compound.
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