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 N-[4-(3-aminoprop-1-ynyl)-2-ethylphenyl]-2-oxo-1,3-dihydroimidazole-4-carboxamide is given. What is its corresponding molecular formula?
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C15H16N4O2
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