27796
In aged mice , R - flurbiprofen had only weak antinociceptive efficacy and it failed to restore normal anandamide levels after nerve injury .
 Chemical: R - flurbiprofen; Chemical: anandamide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: R - flurbiprofen, anandamide 
Answer:
 Chemical: R - flurbiprofen; Chemical: anandamide