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Abstract
Five new biguanides, found as impurities in chlorhexidine digluconate solutions, were synthesized by addition of amines to aminonitriles. Nonstoichiometric additions required to prepare the unsymmetrical biguanides resulted in low yields of the desired impurities, which were isolated by flash chromatography and characterized by HPLC-UV, HPLC-MS, and 1 H NMR.
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