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Carbon-13 NMR spectra of the stable polymorphs of solid bambuterol hydrochloride (BHC) and terbutaline sulfate (TBS) are reported and the resonances assigned with the aid of solution-state spectra. A protocol is presented for quantification of BHC in a formulation in lactose, together with TBS, relative to a reference peak from magnesium stearate. This protocol compares the intensity of an aromatic...
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