20491
The rats were divided into ; I - nondiabetic , II - diabetic control , III - sitagliptin ( 5mg / kg , p . o . ) , IV - l - glutamine ( 250mg / kg , p . o . ) , V - l - glutamine ( 500mg / kg , p . o . ) and VI - l - glutamine ( 1000mg / kg , p . o . ) .
 sitagliptin, l - glutamine, l - glutamine, l - glutamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 sitagliptin, l - glutamine, l - glutamine, l - glutamine