3397
Ketamine was more potent in the hypophysectomized chick and the circadian rhythm noted in the intact chick was absent ; furthermore , melatonin did not augment the ketamine DOC whereas dopamine continued to do so .
 Chemical: Ketamine; Chemical: melatonin; Chemical: ketamine; Chemical: dopamine
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: Ketamine; Chemical: melatonin; Chemical: ketamine; Chemical: dopamine