3399
In addition , these data indicate a direct role of the pituitary in the augmentation of ketamine DOC induced by melatonin .
 Chemical: ketamine; Chemical: melatonin
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