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Exploration of triclosan analogs has led to novel diaryl ureas with significant potency against in vitro cultures of drug - resistant and drug - sensitive strains of the human malaria parasite Plasmodium falciparum .
 diaryl ureas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 diaryl ureas