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Name the molecular formula for the molecule established as N-[2-(4-methylpiperazin-1-yl)-1-phenylethyl]-2,2-dioxo-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine-7-carboxamide using the IUPAC nomenclature.
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C21H27N5O3S
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