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While several studies have demonstrated the severe effects of ivermectin on non - target organisms , little is known about the drug ' s impact on free - living nematodes .
 Chemical: ivermectin
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: ivermectin