2668
Nociceptive effects induced by intrathecal administration of prostaglandin D2 , E2 , or F2 alpha to conscious mice .
 Chemical: prostaglandin D2 , E2 , or F2 alpha
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 D2 , E2 , or F2 alpha