You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule propan-2-yl 4-(2,1,3-benzoxadiazol-4-yl)-2,6-dimethyl-5-propan-2-ylsulfanylcarbonyl-1,4-dihydropyridine-3-carboxylate into molecular formula.
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C21H25N3O4S
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