26273
The activation barriers for thermal reversion of 2Q - 4Q , as determined from Arrhenius and Eyring plots , are found to correlate nicely with the helical turn , which decisively determines the steric force .
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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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