20313
When the concentration of EC100cp was increased to 4 - 6 % , the sustained - release formulation F7 and F8 prepared with 4 % EC100cp and 6 % EC100cp , respectively , could control the drug release in a better manner , namely , they could control drug release in the initial hours with a high cumulative amount of drug at 24 h .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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