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Our main objective was to test tea infusions and nonpolar extracts prepared from different A . annua varieties against Plasmodium falciparum in vitro in order to determine if synergism will increase the effectiveness of artemisinin in the samples as compared to pure artemisinin .
 Chemical: 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; Chemical: artemisinin