You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-cyclopropyl-N-(5-fluoro-1H-indazol-3-yl)-1,1-dioxothieno[2,3-g]quinolin-8-amine into its molecular formula.
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C21H15FN4O2S
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