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For different types of phthalate esters , we found a correlation between the ability of transient receptor potential ( TRP ) A1 activation and that of enhancing skin sensitization .
 Chemical: phthalate esters
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: phthalate esters