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-[[4-[4,5-bis(methoxycarbonyl)-2,6-dihydro-1,3-oxazin-3-yl]phenyl]carbamoylamino]propanoic acid is given. What is its corresponding molecular formula?
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C18H21N3O8
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