12811
Male mice ( 26 - 30g ) were pretreated with PC / beta - CD ( 20 or 40mg / kg , p . o . ) , PC ( 20 or 40mg / kg , p . o . ) or vehicle ( distilled water ) , 0 . 5h before painful tests and antinociceptive effect was evaluated at times : 0 . 5 , 1 , 2 , 4 , 8 , and 16h after treatment .
 Chemical: beta - CD
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: beta - CD