Instructions: Consider the reaction sequence below to answer the following question(s) . 
Refer to instructions.The starting material A in this reaction sequence is called a(n) _____.
Definitions:
Accutane
A brand name for isotretinoin, a powerful drug used in the treatment of severe acne.
Defendant's Motion
A formal request made to a court by the defendant challenging or asking for a specific action in a lawsuit.
Business Ethics
The use of ethics and ethical principles to solve business dilemmas.
Special Problems
Unique or complex issues that require specific attention or solutions.
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