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The evaluation of their in vitro activity against Mycobacterium tuberculosis ( H37Rv and strain 43 ) showed promising results in the case of the acylthiourea derivatives ( MIC range 0 . 36 - 7 . 46 mu M for H37Rv strain ) .
 Chemical: acylthiourea
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: acylthiourea