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Condensed pyridines are those heterocycles in which five- or six-membered rings are fused with pyridine ring. Several condensed pyridine derivatives have been made and are widely used in pharmaceutical applications. Some of the condensed pyridines are reported as DPP-4 inhibitors, which include dihydro-1H-[1,5]naphthyridin-2-one ring and the like. Some of them have been reported to possess antifungal and antidiabetes activities.