22856
PPG had a more effective response than the reference drug diclofenac sodium in both the models of inflammation .
 Chemical: PPG; Chemical: diclofenac sodium
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: PPG; Chemical: diclofenac sodium