12811
The macrocyclic tetrapeptide natural product CJ - 15 , 208 ( cyclo [ Phe - d - Pro - Phe - Trp ] ) exhibited both dose - dependent antinociception and kappa opioid receptor ( KOR ) antagonist activity after oral administration .
 Chemical: macrocyclic tetrapeptide; Chemical: CJ - 15 , 208; Chemical: cyclo [ Phe - d - Pro - Phe - Trp ]
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: macrocyclic tetrapeptide; Chemical: CJ - 15 , 208; Chemical: cyclo [ Phe - d - Pro - Phe - Trp ]