You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[3-(2-oxopyrrolidin-1-yl)phenyl]-1-(pyridin-3-ylmethyl)-1-(pyridin-4-ylmethyl)urea by IUPAC nomenclature, provide its molecular formula.
user
C23H23N5O2
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