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Nevertheless , MD simulations and free energy analysis predict that both syn - and anti - conformations of OTB - dG are equally stable in helices when paired opposite cytosine .
 Chemical: OTB - dG; Chemical: cytosine
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: OTB - dG; Chemical: cytosine