18154
Married with the potential of this class of molecule as the next generation of effective , resistance - free and safe antimicrobials , and a much better understanding of their biology , pharmacology and pharmacodynamics , the first regulatory approvals and introduction into clinical practice of these promising drug candidates will likely be soon .
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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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