22540
The objective of the study was to establish an in vivo method for assessing cytochrome P450 3A ( CYP3A ) activity using therapeutically inert nanogram doses of midazolam .
 midazolam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 midazolam