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Derivatives of muramyl dipeptide ( MDP ) , the minimal immunomodulatory structure of bacterial cell wall peptidoglycan , have gained considerable attention in the past decades , because of their potent adjuvant effects .
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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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