What is the molecular formula of the structure shown below? 
Definitions:
Expression
A combination of symbols and numbers that represent a mathematical operation or relation.
Difference
The result of subtracting one number from another, or the operation of subtraction itself.
Polynomials
Algebraic expressions that consist of variables and coefficients, combined using only addition, subtraction, multiplication, and non-negative integer exponents.
X
A commonly used variable or symbol to represent an unknown value in mathematics and algebra.
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