3SX4:
reference: 7-Oxopyrrolopyridine-derived DPP4 inhibitors-mitigation of CYP and hERG liabilities via introduction of polar functionalities in the active site., Wang W, Devasthale P, Wang A, Harrity T, Egan D, Morgan N, Cap M, Fura A, Klei HE, Kish K, Weigelt C, Sun L, Levesque P, Li YX, Zahler R, Kirby MS, Hamann LG, Bioorg Med Chem Lett. 2011 Nov 15;21(22):6646-51. Epub 2011 Sep 24. PMID: 21996520

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