title: Letter: The formation of norcodeine from morphine in man.
mesh_terms: D000818:Animals; D003061:Codeine / Q000031:analogs & derivatives* / Q000378:metabolism*; D004340:Drug Contamination; D006801:Humans; D009020:Morphine / Q000378:metabolism*; D051381:Rats
chemical_list: D009020:Morphine; D003061:Codeine