You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(3-acetyl-8-bromo-5-chloro-4-oxo-6,7-dihydro-1H-quinolin-2-yl)sulfanylmethyl]benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H14BrClN2O2S
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