2605
In a counterbalanced , placebo - controlled , double - blind study design , healthy subjects were administered a continuous subanesthetic S - ketamine infusion while differences in BOLD responses measured with fMRI were detected .
 Chemical: S - ketamine
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: S - ketamine