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Compound 12 a was also found to be ~ 18 - fold more efficacious than vancomycin against MRSA ; however , the two compounds were found to have similar efficacy against MRS .
 vancomycin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 vancomycin