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 3-[[[ethylamino-[3-(2-oxopyrrolidin-1-yl)propylamino]methylidene]amino]methyl]benzamide is given. What is its corresponding molecular formula?
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C18H27N5O2
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