Adenine is a purine base and its structure is as follows:
\[
\begin{array}{c}
\text{N} \\
\text{||} \\
\text{C} - \text{C} = \text{N} - \text{H} \\
\text{||} \quad \text{||} \\
\text{N} - \text{C} - \text{N} \\
\text{||} \\
\text{C} - \text{H} \\
\text{||}
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