3696
The effect was attenuated by both the NK1 receptor selective antagonist RP 67 , 580 and the NK2 receptor selective antagonist SR 48 , 968 , given intra - arterially , suggesting that it was mediated by stimulation of both NK1 and NK2 receptors .
 Chemical: RP 67 , 580; Chemical: SR 48 , 968
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: RP 67 , 580; Chemical: SR 48 , 968