You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-[2-(3,5-dimethylpyrazol-1-yl)ethyl]-2-imino-4-methyl-1-oxaspiro[4.5]dec-3-ene-3-carboxamide;dihydrochloride into molecular formula.
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C18H28Cl2N4O2
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