What is the final product of the reaction sequence: 
Definitions:
Psychoactive Drug
A chemical substance that alters perceptions and moods.
Withdrawal
The process of reducing or stopping the use of a substance after prolonged and frequent use, often leading to uncomfortable symptoms.
Heroin
An opioid drug made from morphine, a natural substance taken from the seed pod of various opium poppy plants, known for its addictive properties.
Craving
An intense, urgent, or abnormal desire or longing, especially for a substance or activity that can lead to addictive behavior.
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