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Dihydroartemisinin ( DHA ) , a semi - synthetic derivative of artemisinin isolated from the traditional Chinese herb Artemisia annua L . , has recently been shown to possess antitumor activity in various cancer cells .
 Chemical: Dihydroartemisinin; Chemical: DHA; 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: Dihydroartemisinin; Chemical: DHA; Chemical: artemisinin