You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 4-[3-(2-methyl-3-oxo-1,4-benzoxazin-4-yl)propanoylamino]piperidine-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C20H27N3O5
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