12566
Syntheses and anti - allergic activity of 2 - ( ( bis ( trimethylsilyl ) methylthio / methylsulfonyl ) methyl ) - 5 - aryl - 1 , 3 , 4 - oxadiazoles .
 Chemical: 2 - ( ( bis ( trimethylsilyl ) methylthio / methylsulfonyl ) methyl ) - 5 - aryl - 1 , 3 , 4 - oxadiazoles
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - ( ( bis ( trimethylsilyl ) methylthio / methylsulfonyl ) methyl ) - 5 - aryl - 1 , 3 , 4 - oxadiazoles