11424
Methadone enantiomer and racemate N - demethylation by recombinant - expressed CYP2B6 . 6 and CYP2B6 . 1 was determined .
 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