18008
The root essential oil was distinguished by its high content in acetylenes ( matricaria ester , 4 ; 74 . 3 % ) , while those from flower heads and leaves were dominated by oxygenated sesquiterpenes ( 61 . 1 and 50 . 3 % , resp . ) .
 Chemical: acetylenes; Chemical: matricaria ester; Chemical: sesquiterpenes
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: acetylenes; Chemical: matricaria ester; Chemical: sesquiterpenes