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Hess, S. and Dölker, M. and Haferburg, D. and Kretscher, H.P. and Matysik, Frank-Michael and Ortwein, J. and Teubert, U. and Zimmermann, W. and Eger, K. (2001) Separation, analyses and syntheses of trimethoprim impurities. Die Pharmazie 56, p. 306.