2674
Conversely , prostaglandin E2 - induced hyperalgesia was blocked by AH6809 ( greater than or equal to 500 ng ) but not by the substance P antagonist .
 Chemical: prostaglandin E2; Disease: hyperalgesia; Chemical: AH6809
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: prostaglandin E2; Disease: hyperalgesia; Chemical: AH6809