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With a trace fear conditioning paradigm , administration of the 5HT2AR agonist TCB - 2 ( 1 . 0 mg / kg , i . p . ) before the extinction test facilitated the acquisition of extinction of fear memory as compared to vehicle treatment .
 Chemical: TCB - 2
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: TCB - 2