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Second , in order to study the response of RHE to chemical sensitizers , the ( ( 13 ) C ) methyldodecanesulfonate was chosen as an NMR probe , and we compared adducts formed on human serum albumin ( HSA ) in solution and adducts formed in RHE .
 ( ( 13 ) C ) methyldodecanesulfonate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( ( 13 ) C ) methyldodecanesulfonate