2673
The hyperalgesic effect of prostaglandin D2 was blocked by simultaneous injection of a substance P antagonist ( greater than or equal to 100 ng ) but not by AH6809 , a prostanoid EP1 - receptor antagonist .
 Disease: hyperalgesic; Chemical: prostaglandin D2; 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:
 Disease: hyperalgesic; Chemical: prostaglandin D2; Chemical: AH6809