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The 3 - O - sidechains of 19 and 20 point to the so - called hydrophilic side of the macrolide ring , as seen in clarithromycin .
 Chemical: O; Chemical: macrolide; Chemical: clarithromycin
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: O; Chemical: macrolide; Chemical: clarithromycin