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However , even at relatively high concentrations of chlorides , a small fraction of FSI may still be present , producing a bactericidal effect with concentrations at the nanomolar level under optimum conditions .
 Chemical: chlorides
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: chlorides