5479
The ONIOM , based on the hybridization of QM / MM ( DFT , 6 . 31 + + G ( d , p ) / UFF ) methodology , was also performed by Gaussian 2003 package .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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