What is the starting material in the reaction shown below? 
Definitions:
Dermis
The thick layer of living tissue below the epidermis that forms the true skin, containing sweat glands, hair follicles, and other structures.
Dermatologist
A medical doctor specializing in the diagnosis and treatment of skin disorders.
Dermatology
The branch of medicine dealing with the skin, nails, hair, and their diseases.
Albinism
A genetic condition characterized by a lack of melanin pigment in the skin, hair, and eyes, leading to sensitivity to sunlight and vision problems.
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