A novel series of oxadiazole based amides have been shown to be potent DPP-4 inhibitors. The optimized compound 43 exhibited excellent selectivity over a variety of DPP-4 homologs.
        
Representative scheme of DPP4N_Peptidase_S9 structure and an image from PDBsum server
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Databases
PDB-Sum
2HHA Previously Class, Architecture, Topology and Homologous superfamily - PDB-Sum server
FSSP
2HHAFold classification based on Structure-Structure alignment of Proteins - FSSP server