9080
Furthermore , in an in vitro bioassay , compounds 1 , 9 , 11 , 13 , 14 , and 18 showed moderate inhibitory effects on nitric oxide production in LPS - induced macrophages at 5 mu M ; all compounds were inactive when tested against five human cancer cell lines ( IC ( 50 ) values > 1 mu M ) .
 Chemical: nitric oxide
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: nitric oxide