The following polymer segment can be produced using an olefinic metathesis reaction. To produce the polymer, the reaction is repeated many times. 
The name of the reactant is__________.
Definitions:
Malignant Tumor
A cancerous growth capable of invading nearby tissues and spreading to different body parts, posing serious health risks.
Epithelial Tissue
A protective tissue that covers the body surface, lines internal organs, and forms glandular tissue.
Carcinoma
A type of cancer that begins in the skin or in tissues that line or cover internal organs.
Granulation Tissue
New vascular tissue in granular form on an open wound, which is indicative of the healing process.
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