You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 1-[4-(8-but-3-enoxy-[1,2,4]triazolo[1,5-a]pyrazin-6-yl)-5-methoxypyrimidin-2-yl]-N-ethylethanamine is given. What is its corresponding molecular formula?
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C18H23N7O2
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