You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (2S)-2-(5-chloro-4-oxo-3-pyridin-3-ylquinazolin-2-yl)pyrrolidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23ClN4O3
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