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Fostriecin ( FST , 1 ) is a natural product with promising antitumor activity produced by Streptomyces pulveraceus .
 Chemical: Fostriecin; Chemical: FST
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: Fostriecin; Chemical: FST