15768
Saline for control group and different doses of ketamine for four treatment groups ( 40 , 60 , 80 and 100 mg kg ( - 1 ) ) were administered intraperitoneal twice a day for 2 weeks .
 Chemical: ketamine
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: ketamine