23189
In vitro COX - 1 / COX - 2 inhibition structure - activity studies identified compound 8a as a highly potent ( IC50 = 0 . 1 mu M ) , and an extremely selective [ COX - 2 ( SI ) > 1000 ] comparable to celecoxib [ COX - 2 ( SI ) > 384 ] , COX - 2 inhibitor that showed superior anti - inflammatory activity ( ED50 = 72 . 4mg / kg ) relative to diclofenac ( ED50 = 114mg / kg ) .
 Chemical: celecoxib; Chemical: diclofenac
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: celecoxib; Chemical: diclofenac