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CYP2B6 inhibition reduces methadone N - demethylation and clearance , and alters methadone concentrations , demonstrating an important role for CYP2B6 in clinical methadone disposition .
 Chemical: methadone; Chemical: N; Chemical: methadone; Chemical: methadone
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; Chemical: methadone; Chemical: methadone