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The gas - phase structures of five conformers of diisopropyl ketone were optimized using ab initio calculations at the MP2 / 6 - 311 + + G ( d , p ) level of theory .
 diisopropyl ketone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 diisopropyl ketone