11423
This investigation compared methadone N - demethylation by CYP2B6 . 6 with that by wild - type CYP2B6 . 1 .
 Chemical: methadone; Chemical: N
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: methadone; Chemical: N