9514
The ionic liquids with different cations and anions were investigated in this work and 0 . 5 M 1 - butyl - 3 - methylimidazolium bromide solution was selected as solvent .
 Chemical: 1 - butyl - 3 - methylimidazolium bromide
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: 1 - butyl - 3 - methylimidazolium bromide