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 tert-butyl 3-[[N-(3,4-dihydro-2H-chromen-4-ylmethyl)-N'-methylcarbamimidoyl]amino]azetidine-1-carboxylate;hydroiodide is given. What is its corresponding molecular formula?
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C20H31IN4O3
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