You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3,4-dichlorophenyl)methylsulfanyl]-4-(3,4-dimethoxyphenyl)-6-methyl-7,8-dihydro-5H-1,6-naphthyridine-3-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H23Cl2N3O2S
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