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-methyl-3-[C-methyl-N-[(5-methyl-1,3,4-thiadiazol-2-yl)methyl]carbonimidoyl]-3,6a-dihydropyrano[3,2-c]quinoline-2,5-dione by IUPAC nomenclature, provide its molecular formula.
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C19H18N4O3S
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