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 ethyl 4-(3,4-dihydro-2H-pyrano[3,2-b]pyridin-4-ylcarbamoyl)-2,3-dihydro-1H-imidazole-2-carboxylate is given. What is its corresponding molecular formula?
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C15H18N4O4
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