4421
LPS - induced production of PGE ( 2 ) and tumour necrosis factor - alpha ( TNF - alpha ) were blocked by rosemary .
 Chemical: PGE ( 2 )
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: PGE ( 2 )