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As diquat is not persistent , snails were exposed for short times ( 5 , 24 , and 48 h ) to ecologically relevant concentrations ( 22 . 2 , 44 . 4 , and 222 . 2 mu g l ( - 1 ) ) of diquat dibromide .
 Chemical: diquat; Chemical: diquat dibromide
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: diquat; Chemical: diquat dibromide