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What is the molecular formula of the compound with this IUPAC name (4'aS,5R)-1-(4-chlorophenyl)-8'-nitrospiro[1,3-diazinane-5,5'-2,4,4a,6-tetrahydro-1H-[1,4]oxazino[4,3-a]quinoline]-2,4,6-trione ?
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C21H17ClN4O6
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