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Combined potential energy mapping and RRKM calculations of dissociation rate constants identified N - C ( alpha ) bond cleavages as the most favorable dissociation pathways , in a stark contrast to the experimental results .
 Chemical: N - C ( alpha )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: N - C ( alpha )