3KWJ:
reference: Aryl- and heteroaryl-substituted aminobenzo[a]quinolizines as dipeptidyl peptidase IV inhibitors., Boehringer M, Fischer H, Hennig M, Hunziker D, Huwyler J, Kuhn B, Loeffler BM, Luebbers T, Mattei P, Narquizian R, Sebokova E, Sprecher U, Wessel HP, Bioorg Med Chem Lett. 2010 Feb 1;20(3):1106-8. Epub 2009 Dec 6. PMID: 20031408

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