You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named benzyl N-[2-[[6-chloro-3-(3-chlorobenzoyl)pyridin-2-yl]-methylamino]-2-oxoethyl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C23H19Cl2N3O4
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