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3. Lehmann-Lintz, T.; Heckel, A.; Thomas, L.; Mark, M. PCT Int. Appl. 2001, WO 2001021604
4. Uragg, H.; Maul, C.; Buschmann, H.; Sundermann, B.; Haurand, M.; Chizh, B. PCT Int. Appl. 2003, WO 2003051369 and references therein
5. Stereoselective Synthesis of Piperidines