4032
For isoproturon , pulsed exposures had a lower impact than a corresponding continuous exposure , whereas the effect of pentachlorophenol delivered in pulses was greater .
 Chemical: isoproturon; 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: pentachlorophenol