22428
In our ongoing investigation into Artemisia annua for the treatment of malaria , we decided to study the possibility that synergism might enhance the efficacy of artemisinin .
 Chemical: artemisinin
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: artemisinin