16803
Three types of hybrid functionals ( B3LYP , X3LYP , and M06 - 2X ) and four basis sets ( 6 - 31G ( d ) , 6 - 31G ( d , p ) , 6 - 311G ( d ) , and 6 - 311G ( d , p ) ) are applied to predict the molecular geometries of the reactants , products and transition sates , and energy barriers .
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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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