What is the starting material in the following reaction? 
Definitions:
Circular Smooth Muscle
Smooth muscle fibers arranged in circular bands in various organs, such as the intestines, aiding in the constriction and movement of content.
Longitudinal Smooth Muscle
Muscle fibers arranged parallel to the long axis of an organ, contributing to its contraction and relaxation, found in the walls of internal organs.
Muscularis
Muscular coat of a hollow organ or tubular structure.
Peristalsis
The rhythmic contractions of smooth muscles in the gastrointestinal tract that facilitate the movement of food and waste.
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