1217
Intra - plantar injection of carrageenan decreased either spontaneous or mechanically / electrically evoked activity of PL cortex pyramidal neurons which responded with excitation in a way prevented by CPCOOEt , a selective mGluR1 antagonist , though not by MPEP , a selective mGluR5 antagonist .
 Chemical: CPCOOEt; Chemical: MPEP
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: CPCOOEt; Chemical: MPEP