You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-(2,3-dimethoxyphenyl)-3-[(2-fluorophenyl)methylsulfanyl]-2,6-dihydro-[1,2,4]triazino[1,6-c]quinazolin-1-one by IUPAC nomenclature, provide its molecular formula.
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C25H21FN4O3S
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