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 5-amino-2-[2-(3,4-diethoxyphenyl)ethynyl]-3-methyl-N-prop-2-ynylimidazole-4-carboxamide is given. What is its corresponding molecular formula?
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C20H22N4O3
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