23191
The study showed that the homosulfonamide fragment of 8a inserted deep inside the 2 degrees - pocket of the COX - 2 active site , where the SO2NH2 group underwent H - bonding interaction with Gln ( 192 ) ( 2 . 95 A ) , Phe ( 518 ) ( 2 . 82 A ) and Arg ( 513 ) ( 2 . 63 and 2 . 73 A ) .
 Chemical: homosulfonamide; Chemical: SO2NH2; Chemical: H; Chemical: Gln; Chemical: Phe; Chemical: Arg
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: homosulfonamide; Chemical: SO2NH2; Chemical: H; Chemical: Gln; Chemical: Phe; Chemical: Arg