13478
The composition of 55 samples of essential oil isolated from the aerial parts of wild growing Myrtus communis L . harvested in 16 locations from East to West Algeria were investigated by GC ( determination of retention indices ) and ( 13 ) C - NMR analyses .
 Chemical: ( 13 ) C
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: ( 13 ) C