12349
The barrier for C1 attack is computed to be 8 . 9 kcal / mol lower than that for C2 attack , in agreement with the experimentally observed regioselectivity of the enzyme .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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