23019
Subsequently , changes in hepatic microsomal CYP3A activity and the pharmacokinetic profiles of midazolam and 1 ' - hydroxy midazolam in plasma were studied to evaluate CYP3A activity .
 midazolam, 1 ' - hydroxy midazolam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 midazolam, 1 ' - hydroxy midazolam