3CCC:
reference: Structure-based design and synthesis of benzimidazole derivatives as dipeptidyl peptidase IV inhibitors., Wallace MB, Feng J, Zhang Z, Skene RJ, Shi L, Caster CL, Kassel DB, Xu R, Gwaltney SL 2nd, Bioorg Med Chem Lett. 2008 Apr 1;18(7):2362-7. Epub 2008 Mar 4. PMID: 18346892

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