20501
Of the indolyl - 3 - acetonitriles synthesized , compound 2k , which possesses a hydroxyl group at C - 7 position of the indole ring and an N - methyl substituent , more potently inhibited NO and PGE2 productions and was less cytotoxic than arvelexin on macrophage cells .
 Chemical: indolyl - 3 - acetonitriles; Chemical: hydroxyl; Chemical: indole; Chemical: N - methyl; Chemical: NO; Chemical: PGE2; Chemical: arvelexin
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: indolyl - 3 - acetonitriles; Chemical: hydroxyl; Chemical: indole; Chemical: N - methyl; Chemical: NO; Chemical: PGE2; Chemical: arvelexin