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KEMSTRO™ (baclofen orally disintegrating tablets) is a muscle relaxant and antispastic. Baclofen USP is a white to off-white, odorless or practically odorless crystalline powder. It is slightly soluble in water, very slightly soluble in methanol, and insoluble in chloroform. Its chemical name is 4-amino-3- (4-chlorophenyl)-butanoic acid. The molecular weight of baclofen is 213.66 and the empirical formula is C₁₀H₁₂C₁NO₂. The structural formula is represented below