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Consequently , the relative effects of pulsed ( 2 and 4 d ) and continuous exposures of the duckweed Lemna minor to isoproturon , metsulfuron - methyl , and pentachlorophenol over a period of 42 d were explored in the present study .
 Chemical: isoproturon; Chemical: metsulfuron - methyl; Chemical: pentachlorophenol
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: isoproturon; Chemical: metsulfuron - methyl; Chemical: pentachlorophenol