You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-amino-1-(5-ethylsulfanyl-1,3,4-thiadiazol-2-yl)-4-(furan-2-yl)-7,7-dimethyl-5-oxo-6,8-dihydro-4H-quinoline-3-carbonitrile by IUPAC nomenclature, provide its molecular formula.
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C20H21N5O2S2
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