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-[4-[(1S,2E)-2-(6-chloro-3-oxo-4H-quinoxalin-2-yl)-1-hydroxy-2-hydroxyiminoethyl]phenyl]acetamide into molecular formula.
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C18H15ClN4O4
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