18598
This inhibition was blocked when mice were pretreated with the selective H3R agonist R - ( alpha ) - methyl - histamine ( 10 mg / kg ) .
 Chemical: R - ( alpha ) - methyl - histamine
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: R - ( alpha ) - methyl - histamine