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Interestingly , while the parent macrolide , azithromycin , accumulates approximately 3 - fold more than clarithromycin , among macrolones all clarithromycin derivatives accumulated in PMNs significantly more than their azithromycin counterparts .
 macrolide, azithromycin, clarithromycin, macrolones, clarithromycin, azithromycin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 macrolide, azithromycin, clarithromycin, macrolones, clarithromycin, azithromycin