29835
Transition state theory , applied to the rate constant k2 that characterizes the irreversible step , provides activation parameters consistent with a highly organized transition state ( Delta S ( |= ) = - 43 ( 7 ) cal . mol ( - 1 ) K ( - 1 ) ) and a remarkably low enthalpic barrier ( Delta H ( |= ) = 6 . 7 ( 2 ) kcal . mol ( - 1 ) ) .
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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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