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( 13 ) C NMR spectra , DLS , and circular dichroism spectra were employed to study the mechanism of the sol - gel phase transition .
 Chemical: ( 13 ) C
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: ( 13 ) C