Provide the structure of a region of the polymer that is produced when the following isocyanate is treated with 1,4-butanediol. 
Definitions:
Adjacent Side
In a right-angled triangle, the side that is next to the angle of interest and forms one side of that angle.
Opposite Side
Typically refers to the side that is diametrically opposed to a referenced side or point, often used in geometrical contexts or discussions of relative positions.
Cosine
In trigonometry, it is the ratio of the adjacent side of the angle and the hypotenuse.
Adjacent
Next to or beside.
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