The presence of an inhibitor of ethylmorphine N-demethylase in old ethylmorphine.
D000818:Animals; D004355:Drug Stability; D005036:Ethylmorphine / Q000494:pharmacology*; D005037:Ethylmorphine-N-Demethylase / Q000037:antagonists & inhibitors*; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology; D009022:Morphine Derivatives / Q000494:pharmacology*; D010089:Oxidoreductases, N-Demethylating / Q000037:antagonists & inhibitors*; D051381:Rats
D009022:Morphine Derivatives; D010089:Oxidoreductases, N-Demethylating; D005037:Ethylmorphine-N-Demethylase; D005036:Ethylmorphine