11548
The presence of methyl vinyl ketone and acetic anhydride in CSE was confirmed by gas chromatography - mass spectrometry ( GC / MS ) .
 Chemical: methyl vinyl ketone; Chemical: acetic anhydride
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: methyl vinyl ketone; Chemical: acetic anhydride