21325
Here , to resolve the neuronal circuitry mediating hemopressin ' s actions , we have combined blood - oxygen - level - dependent , pharmacological - challenge magnetic resonance imaging with c - Fos functional activity mapping to compare brain regions responsive to systemic administration of hemopressin and the synthetic CB1 inverse agonist , AM251 .
 Chemical: hemopressin; Chemical: oxygen; Chemical: hemopressin; Chemical: AM251
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: hemopressin; Chemical: oxygen; Chemical: hemopressin; Chemical: AM251