5658
This review article focuses on the status of advanced lead candidates of DPP group and their binding affinity with the active site residue of target structure which help in discovery of potent and selective DPP - 4 inhibitors by lead optimization approach .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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