You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N'-ethyl-4-(1-methylpyrazol-4-yl)-3-oxo-N-spiro[2-oxabicyclo[3.2.0]heptane-7,1'-cyclobutane]-6-ylpiperazine-1-carboximidamide by IUPAC nomenclature, provide its molecular formula.
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C20H30N6O2
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