You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 4-[(Z)-[2-[2-(3,4-dimethoxyphenyl)ethylamino]-2-oxoethoxy]iminomethyl]benzoate by IUPAC nomenclature, provide its molecular formula.
user
C21H24N2O6
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