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-(2-amino-3-methylimidazo[1,2-a]pyridin-6-yl)-5-ethyl-1,3-oxazol-2-yl]pyrazine-2-carboxamide is given. What is its corresponding molecular formula?
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C18H17N7O2
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