27696
More than three quarters of arable farms used anticoagulant rodenticides ; predominately the second generation compounds difenacoum and bromadiolone .
 difenacoum, bromadiolone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 difenacoum, bromadiolone