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In the preceding letter , we detailed the discovery of clinical candidate PF - 04693627 , a potent mPGES - 1 inhibitor possessing a novel benzoxazole structure .
 PF - 04693627, benzoxazole
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PF - 04693627, benzoxazole