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Tributyltin ( TBT ) is a ubiquitous marine contaminant due to its extensive use as a biocide , fungicide and antifouling agent .
 Chemical: Tributyltin; Chemical: TBT
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: Tributyltin; Chemical: TBT