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FTIR spectroscopy shows that dissolving a carboxylic acid anhydride in IL - F leads to the formation of acyl fluoride .
 Chemical: carboxylic acid anhydride; Chemical: acyl fluoride
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: carboxylic acid anhydride; Chemical: acyl fluoride