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Based on the presence of the 2 , 2 ' - biphenol core , we further studied whether achyrofuran killed bacteria through a mechanism of action similar to that reported for the naturally occurring antibiotic MC21 - A .
 Chemical: 2 , 2 ' - biphenol; Chemical: achyrofuran; Chemical: MC21 - A
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: 2 , 2 ' - biphenol; Chemical: achyrofuran; Chemical: MC21 - A