21024
Furthermore , as nanocarrier systems can at least to some extent diffuse into the mucus gel layer releasing their payload there , a presystemic metabolism of the drug on the way between the delivery system and the absorption membrane can be excluded .
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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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