You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (E)-[tert-butyl(methyl)amino]-oxido-[(3R)-1-[3-(5-oxo-4H-1,3-oxazol-2-yl)phenyl]pyrrolidin-3-yl]oxyiminoazanium into molecular formula.
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C18H25N5O4
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