What is the final product of the following reaction sequence? Give structural details of all significant intermediates. 
Definitions:
Inhalation
The act of breathing in; the intake of air or other substances into the lungs.
Sphenoidal Polyp
An abnormal growth in the sphenoid sinus, a cavity within the skull behind the nasal passages.
Correct Code
The accurate numerical or alphanumerical representation used to identify specific medical diagnoses, procedures, or services in healthcare documentation and billing.
Breathing
The physiological process of inhaling oxygen and exhaling carbon dioxide from the atmosphere.
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