Provide a mechanistic explanation for the formation of the observed products in the following reaction. 
Definitions:
Methadone
A synthetic opioid used as a pain reliever and as part of drug addiction detoxification and maintenance programs. It can help reduce withdrawal symptoms in people addicted to heroin or other narcotic drugs.
Alcoholics Anonymous
A fellowship of men and women who share their experience, strength, and hope with each other to solve their common problem and help others recover from alcoholism.
Group Therapy
A form of psychotherapy that involves one or more therapists working with several people at the same time.
Degree of Intoxication
A measure of how much a substance, typically alcohol or drugs, has affected a person's mental and physical abilities.
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