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The natural product tryptanthrin ( 1a ) represents a potential lead for new tuberculosis ( TB ) drugs since tryptanthrin and its synthetic analogues possess potent in vitro activity against Mycobacterium tuberculosis ( Mtb ) .
 Chemical: tryptanthrin; Chemical: tryptanthrin
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: tryptanthrin; Chemical: tryptanthrin