The formula for calculating the degree of unsaturation (DU) is:
\[ \text{DU} = \frac{1}{2} \left( 2C + 2 + N - H - X \right) \]
where \( C \) is the number of carbons, \( H \) is the number of hydrogens, \( N \) is the number of nitrogens, and \( X \) is the
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