You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 2-[[2-[4-(ethylcarbamoyl)phenyl]-2-[2-hydroxyethyl(3-methoxypropanoyl)amino]acetyl]amino]acetate by IUPAC nomenclature, provide its molecular formula.
user
C21H31N3O7
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