You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-bromo-3-(3-ethoxypropyl)-2-[2-(4-methylphenyl)-2-oxoethyl]sulfanylquinazolin-4-one by IUPAC nomenclature, provide its molecular formula.
user
C22H23BrN2O3S
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