You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-amino-4-(4-chlorophenyl)-N-(2-fluorophenyl)-6-methyl-7,8-dihydro-5H-thieno[2,3-b][1,6]naphthyridine-2-carboxamide into its molecular formula.
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C24H20ClFN4OS
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