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Low concentrations of thiol groups completely inactivated silver , while methylsulphur groups only affected its efficacy at very high concentrations .
 Chemical: thiol; Chemical: silver; Chemical: methylsulphur
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: thiol; Chemical: silver; Chemical: methylsulphur