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Eventually , optimized drug release ( 5 - 10min mean dissolution time , 50 - 55 % bioadhesion retention ) could be achieved with 550 mu m pellet size , containing carbomer and hydroxyethylcellulose in 85 : 15 ratio .
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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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