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Ten compounds have been identified , in which 3 - methylthio - 1 - propene was the most significant component .
 Chemical: 3 - methylthio - 1 - propene
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: 3 - methylthio - 1 - propene