You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(4-cyanophenyl)methylsulfanyl]-4-(furan-2-yl)-5-oxo-7,8-dihydro-6H-quinoline-3-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H15N3O2S
assistant