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What is the molecular formula of the compound with this IUPAC name methyl (1'S,6'S)-7'-benzyl-3',9'-dioxospiro[1,3-dithiane-2,11'-2,4,7,8-tetrazatricyclo[6.3.0.01,5]undecane]-6'-carboxylate ?
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C19H22N4O4S2
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