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Antimicrobial N - halamine polymers and coatings have been studied extensively over the past decade thanks to their numerous qualities such as effectiveness toward a broad spectrum of microorganisms , long - term stability , regenerability , safety to humans and environment and low cost .
 Chemical: N - halamine polymers
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: N - halamine polymers